The main point of the article "State “Personhood” Laws Threaten Embryonic Steam Cell Research" is that the passing of "personhood" laws in some states of the United States, which define life as beginning at conception, poses a threat to embryonic stem cell research. The article argues that these laws could hinder or even criminalize research involving the destruction of human embryos, which is a critical aspect of embryonic stem cell research. The article also discusses the potential consequences of such laws on medical research, including the inability to develop treatments for a wide range of diseases and conditions
The image below shows how wolves and dogs compare to some other animals in the levels of classification. (5 points)
Based on the chart, how are insects and dogs related?
A. They belong to the same domain and phylum.
B. They belong to the same domain but different kingdoms.
C. They belong to the same kingdom and phylum.
D. They belong to the same kingdom but different phyla.
Based on the chart, insects and dogs belong to the same domain but different kingdoms.
What is the significance of the domain in the classification hierarchy?The domain is the highest level of classification in the hierarchy, and it groups living organisms based on their cellular organization and basic biochemistry. The three domains (Bacteria, Archaea, and Eukarya) represent three different evolutionary lineages that diverged early in the history of life on Earth. Understanding the domain to which an organism belongs is useful for understanding its basic cellular and biochemical processes, and can provide insights into its evolutionary history.
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Answer:
They belong to the same kingdom but different phyla.
Explanation:
Tbh insects and dogs belong to Animalia (a kingdom), but they also belong in different phyla. While insects belong to the phylum Arthropoda, dogs belong to the phylum chordata.
I got it right on my test (;
Hope this helps:
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What might happen if the number of chromosomes within the cells did not change, but new daughter cells were still made?.
If the number of chromosomes within the cells did not change, but new daughter cells were still made, the resulting daughter cells would have the same number of chromosomes as the parent cell.
This is known as mitotic division, which is a process of cell division that produces two identical daughter cells with the same number of chromosomes as the parent cell.
If the process of mitotic division was disrupted, it could result in a range of problems. For example, if the chromosomes did not segregate properly during mitosis, the resulting daughter cells could have an abnormal number of chromosomes. This is known as aneuploidy, and it can lead to genetic disorders and other health problems.
Additionally, if the process of mitotic division was disrupted, it could result in the accumulation of damaged or abnormal cells in the body. This can increase the risk of developing cancer and other diseases. Therefore, proper mitotic division is crucial for maintaining the integrity of the genetic material and ensuring the health of the organism.
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Explain how enzymes assist the process of absorption.
The process of absorption involves the breakdown of complex molecules into simpler ones that can be easily absorbed and used by the body.
What are Enzymes?
Specialized proteins called enzymes accelerate or hasten chemical reactions in living things. They play a key role in a number of biological functions, including digestion, metabolism, and DNA replication, and are crucial for cells to function properly.
By reducing the activation energy needed for a chemical reaction to happen, enzymes work. In other words, they facilitate the reaction between the reactants and the formation of the products. Enzymes accomplish this by attaching to the substrates or reactants in a manner that brings them close together and positions them in a way that facilitates the reaction.
Protein molecules called enzymes accelerate or hasten chemical reactions in the body. The process of absorption, which involves the transfer of nutrients and other substances from the digestive tract into the bloodstream, depends heavily on enzymes.
In order for the body to absorb and use complex chemicals, they must first be broken down into smaller molecules. Several digestive enzymes, which are produced by diverse digestive system organs, aid in this breakdown process.
For instance, the enzyme amylase aids in the conversion of carbohydrates into simple sugars in the mouth. Pepsin and hydrochloric acid aid in the digestion of proteins into smaller peptides in the stomach. Lipase, amylase, and other pancreatic enzymes are created in the small intestine and are proteases aid in the breakdown of proteins, carbohydrates, and lipids.
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Which of the following oxygen classifications contain organisms incapable of causing disease in humans?
Choose one:
A. strict aerobe
B. strict anaerobe
C. facultative anaerobe
D. All classifications contain some organisms capable of causing disease.
All oxygen classifications contain some organisms capable of causing disease hence, option D is correct
What do you mean by oxygen classifications?
In biology, oxygen can be classified in different ways depending on the context. Here are a few possible classifications:
Elemental oxygen: This refers to the pure form of oxygen, which is a colorless, odorless gas with the chemical symbol O2.
Reactive oxygen species (ROS): These are chemically reactive molecules containing oxygen that can damage cells and contribute to aging and disease. Examples of ROS include hydrogen peroxide, superoxide anion, and hydroxyl radical
Therefore, All oxygen classifications contain some organisms capable of causing disease hence, option D is correct
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modifications to chromatin can affect transcriptional activity by changing the accessibility of dna to the transcription machinery. the given descriptions are examples of various processes that may or may not cause remodeling of chromatin. match each description to the effect it has on transcriptional activity caused by chromatin remodeling. Match each description to the effect it has on transcriptional activity caused by chromatin remodeling.( Activates, No effect, Inactivates, Activates and inactivates) Answer Bank RNA polymerase II binds the start site of transcription. Methylated CpG islands are often close to transcription start sites. Histone acetyltransferases attach acetyl groups to the N-terminus of histones. Histone methylation occurs at different amino acids
Histones are proteins that package and organize DNA in the nucleus of eukaryotic cells. They are responsible for forming the chromatin structure of chromosomes, which helps to protect DNA and control its accessibility to various cellular processes such as transcription and DNA replication.
There are five main types of histones, including H1, H2A, H2B, H3, and H4, which form the basic unit of chromatin, known as the nucleosome. Histones can be modified through various chemical modifications, such as acetylation and methylation, to control the expression of genes.
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Which of the following is the tissue that would be found covering the outside of the large intestine?
A
parietal peritoneum
B
visceral peritoneum
C
visceral pericardium
D
parietal pleura
The visceral peritoneum is the tissue that covers the outside of the large intestine. Therefore, option B is correct.
What are visceral peritoneum tissues?Visceral peritoneum tissue is made up of a mesothelium layer that is supported by a very thin layer of connective tissue.
The visceral peritoneum entirely encloses the intraperitoneal organs. The liver, spleen, stomach, jejunum, ileum, transverse colon, sigmoid colon, and superior section of the rectum are among these organs.
Thus, the visceral peritoneum is the tissue that covers the outside of the large intestine. Therefore, option B is correct.
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FIll in the blanklipids, detoxifying enzymes, and membrane components are produced and stored in the ____ endoplasmic reticulum.
Answer:
Explanation:
Detoxifying enzymes and membrane components are produced and stored in the "smooth" endoplasmic reticulum (ER).
The smooth ER is a type of endoplasmic reticulum that lacks ribosomes, which are the structures responsible for protein synthesis. Instead, the smooth ER is involved in a variety of cellular functions, including lipid synthesis, carbohydrate metabolism, and detoxification of drugs and other toxins.
Detoxifying enzymes are produced in the smooth ER and are responsible for breaking down harmful substances and making them less toxic or more easily excreted by the body. The smooth ER is also involved in the synthesis of membrane lipids and the regulation of calcium ion concentrations in the cytoplasm.
for any pair of alleles of a given gene, the same dominant/recessive relationship will be found for all phenotypes affected by that genetruefalse
The statement that " for any pair of alleles of a given gene, the same dominant/recessive relationship will be found for all phenotypes affected by that gene is True.
How are relationships affected by phenotypes ?The relationship between alleles and the resulting phenotype can be influenced by factors such as incomplete dominance, codominance, or epistasis.
In incomplete dominance, neither allele is completely dominant over the other, resulting in an intermediate phenotype. In codominance, both alleles are expressed equally in the phenotype, resulting in a combined or mixed phenotype.
However, the same dominant/recessive relationship will often exist in the phenotypes affected by a particular gene.
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Is catalase an anabolic enzyme or a catabolic enzyme? How do you know?
Catalase is a catabolic enzyme. It is responsible for breaking down hydrogen peroxide into water and oxygen, which is a process that releases energy. Catabolic reactions break down complex molecules into simpler ones and release energy, whereas anabolic reactions build complex molecules from simpler ones and require energy input. Since catalase is breaking down a molecule, it is considered a catabolic enzyme.
Drag the labels to complete each of the sentences that discuss the source of essential nutrients available to microbes CHONPS Regardless of an organism's ability to reside in seemingly inhospitable conditions, all cells require certain obtain those nutrients varies from organism to organism, and there is no greater versatility than the ability of variety of sources for survival How they autotrophs to harness chemicals from a N2 gas heterotrophs is the acronym used to describe the list of essential nutrents required by all organisms tor survival. Heterotrophs differ from autotrophs in how they obtain their source of carbon organisms to provide them with organic molecules such as proteins and nucleio acids, whereas must rely on other ATP are able to "ix carbon from making them nutritionally independent Potassium Nitrogen is essential tor the fomation of proteins nucieic acids, and the source of cellular energy, mW the form of --., The main reservoir of earth's nitrogen is in which is unavailable for cellular use. A few species which converts gaseous nitrogen into of bacteria can carry out Phosphorus a usable form As with carbon, heterotrophs must obtain their nitrogen from the organic molecuies of otner organisms inorganic CO2 nitrogen fixation bacteria essential for the formation of membranes, nucleic acids, and ATP, as well as sulfur, necessary for certain amino acids, must be harnessed from mineral deposits in rocks and oceans nutrients Reset
Regardless of an organism's ability to reside in seemingly inhospitable conditions, all cells require certain essential nutrients for survival. How they obtain those nutrients varies from organism to organism, and there is no greater versatility than the ability of autotrophs to harness chemicals from a variety of sources for survival.
What is nutrients ?Nutrients are substances found in food that are essential for life and health. They provide energy for physical activity and support normal growth and development. There are six main classes of nutrients: carbohydrates, proteins, fats, vitamins, minerals, and water. Carbohydrates provide the body with energy, proteins are essential for building and repairing tissues, and fats supply the body with energy and help absorb certain vitamins.
CHONPS is the acronym used to describe the list of essential nutrents required by all organisms for survival. Heterotrophs differ from autotrophs in how they obtain their source of carbon, relying on other organisms to provide them with organic molecules such as proteins and nucleic acids, whereas autotrophs are able to "fix" carbon from inorganic CO2, making them nutritionally independent.
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Which of the following is an example of an internal cost?
air pollution produced from manufacturing a product
health issues of workers in a factory
wages paid to workers in a company
ecosystem damage from clearing land to expand a company's buildings
Here is an illustration of an internal cost air pollution resulted by a product's manufacturing.
What is an easy way to define ecosystem?An ecosystem is a region where a bubble of life is created by plants, animals, and certain other organisms interacting with the weather, environment, and other factors. Abiotic variables, or nonliving aspects, coexist with mycorrhizal fungi in environments. Plants, animals, and certain other species are biotic factors.
Who decides what an ecosystem is?Tansley asked Arthur Roy Clapham to come up with the phrase, and he did so. Tansley developed the idea to emphasize the significance of material transfers between organisms & their surroundings.
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The substrate of an enzyme is?A. an organic accessory moleculeB. The molecole(s) released at the end of an enzyme-facilitated reaction.C. The shape of the enzymeD. One of the amino acids that makes up the enzymeE. What the enzyme acts on.
The substrate of an enzyme is what the enzyme acts on. Therefore, option E is correct.
What is an enzyme?Proteins called enzymes serve as biological catalysts by quickening chemical reactions. Substrates are the molecules that enzymes can interact with, and the enzyme changes the substrates into other molecules known as products.
Some examples of enzymes are zymase, ligase, pepsin, DNAase, sucrase, maltase, amylase, proteases, oxidoreductases, and lactase.
Thus, the substrate of an enzyme is what the enzyme acts on. Therefore, option E is correct.
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The genes that code for specific are part of an organism's , the sum of all of its genetic information.
The genes that code for specific are part of an organism's, the sum of all of its genetic information is called genome.
Genes are the basic factors of heredity. They are inherited from one generation to another and that is how each organism receives its characteristics and phenotype. The gene is a part of the DNA strand which is composed of a pair of alleles.
Genome is the entire genetic material of any organism. For example, the human genome comprises of 23 pairs or 46 individual chromosomes. The information of the genome is responsible for an organism to be functional.
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Because the x chromosome contains genes that are vital for normal development, no baby has been born.
The X chromosome plays a critical role in human development, but its absence does not necessarily result in fetal death.
As per the question given,
One of the two sex chromosomes found in humans is the X chromosome, which has many genes essential for healthy development. The development of the immune system, the brain, and the reproductive system are just a few of the vital processes that these genes regulate.
Although these genes are crucial, it is untrue that no child has ever been born without an X chromosome. In fact, a number of diseases, such as Turner syndrome and Klinefelter syndrome, can result in the lack of the X chromosome or its partial deletion. Although these disorders have the potential to seriously harm a child's health and development, miscarriage or stillbirth are not always the results.
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liquid rock found at earths surface
Answer:
magma
Explanation:
. Suppose you were observing an organism through a microscope and noticed that it
moved toward the bottom of the slide and then it moved to the right. What does this
tell you about the actual movement of the organism?
The organism is actually moving upwards and then to the left.
What is a microscope?A microscope is an optical instrument used for observing small objects. It is used in place of an unaided eyes to view relatively small objects e.g. living microbes.
However, during microscope usage, If one moves tge slide to the right, the specimen moves to the left as one is viewing it microscopically.
This occurs due to the use of the mirror in the microscope that makes it appear to move in the opposite direction.
Therefore, according to this question, the organism is moving in the opposite direction of what was described.
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azithromycin is an antibiotic that prevents translation in bacteria so that bacteria cannot replicate and the infection will not get worse. which of the following parts of the cell could be specifically affected by this antibiotic?
Ribosome of the cell could be specifically affected by this antibiotic. So, the correct option is B.
What is Azithromycin?Azithromycin is defined as an antibiotic medicine which is used to treat infections that include chest infections such as pneumonia. ear, nose and throat and nose infections such as sinus infections (sinusitis).
Azithromycin is a type of antibiotic that inhibits translation in bacteria so that the bacteria cannot replicate and worsen the infection, this antibiotic can specifically affect the ribosomes of the cell.
Therefore, the correct option is B.
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Your question is incomplete, most probably the complete question is:
Azithromycin is an antibiotic that prevents translation in bacteria so that bacteria cannot replicate and the infection will not get worse. Which of the following parts of the cell could be specifically affected by this antibiotic?
A: mitochondria
B: ribosome
C: nucleus
D: Golgi complex
your brother has a bacterial infection. he tells you he going to the gym where he plans to sit in the sauna for an hour. he thinks that this will cure his infection, because the heat in the sauna will denature the enzymes of the bacteria making him ill. you are a nursing student who is currently studying microbiology. you tell him that
Answer: His Plan with not work to fix that
Explanation: Homeostasis will keep his body temperature constant even in the sauna, so the bacteria (and his normal microbiota and body cells) will not be impacted.
what is the anticodon for Glutamic Acid in a tRNA sequence
The anticodon for Glutamic Acid in a tRNA sequence is UUC.
What is Glutamic Acid ?Glutamic acid is an essential amino acid that is involved in many processes throughout the body. It is a non-essential amino acid, meaning that it can be produced naturally by the body, but it can also be found in certain foods. Glutamic acid is important for the proper functioning of the brain, muscles, and other organs and tissues. It plays an important role in the production of neurotransmitters such as glutamate, which is involved in learning and memory. Glutamic acid is also involved in energy metabolism, as it helps to convert carbohydrates into energy.
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Which of the following describes how humans can create a sustainable practice between the green system and the meat system?
A) Replacing crops that are slow to grow with livestock that can produce more food
B) Replacing crop farms with low yield and overgrazed ranches with feedlots to address food insecurity
C) Using crop waste to create food deserts and fewer meat options
D) Using seeds and parts of crops that are not consumed by humans as food for livestock
Answer:
Explanation: D) Using seeds and parts of crops that are not consumed by humans as food for livestock is one way that humans can create a sustainable practice between the green system and the meat system. This approach reduces food waste and makes use of resources that might otherwise go unused. It also helps to reduce the demand for crops grown specifically for animal feed, which can lead to deforestation and other environmental problems.
Answer:
D) Using seeds and parts of crops that are not consumed by humans as food for livestock
Explanation:
Using seeds and parts of crops that are not consumed by humans as food for livestock is one way to create a sustainable practice between the green system and the meat system. This practice, known as feed conversion efficiency, involves using crop byproducts to feed livestock instead of relying on grain and other feed sources that require significant amounts of land and resources to produce. By using crop byproducts as feed, the livestock industry can reduce its environmental impact and create a more sustainable food system. Additionally, this practice can help reduce waste and make more efficient use of agricultural resources.
in the figure, if base 4 is adenine, what is base 11' (remember the complimentary configuration of bases in dna)?
In the figure, if base 4 is adenine, then base 11 is adenine
What is Adenine?Adenine is a nitrogen-containing base that is one of the four building blocks of DNA and RNA molecules. It pairs with thymine in DNA and with uracil in RNA.
Adenine is also involved in energy transfer as a component of ATP (adenosine triphosphate), which is a molecule that cells use to store and transport energy. Hence the answer is adenine
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In the figure, if base 4 is adenine, what is base 11' (remember the complimentary configuration of bases in DNA)?
cytosine
uracil
adenine
thymine
guanine
He later does another capture exercise at the community garden near the high school. In this area, he captured and marked 40 butterflies. The traps in this location found 100 butterflies where 50 of them had tags. What is the population size of the butterflies at the school? Show work.
Answer:
Explanation:
To estimate the population size of the butterflies at the school, we can use the Lincoln-Petersen index. This index is based on the assumption that the proportion of marked individuals in the second sample is the same as the proportion of marked individuals in the total population.
According to the problem statement, the following information is given:
First capture:
Number of marked butterflies: 30
Total number of butterflies: 100
Second capture:
Number of marked butterflies: 50
Total number of butterflies: 100
Using the Lincoln-Petersen index, we can estimate the population size (N) as follows:
N = (M x n) / m
where M is the number of individuals marked in the first capture, n is the total number of individuals in the second capture, and m is the number of marked individuals in the second capture.
Substituting the values we have:
N = (30 x 100) / 50
N = 60
This means that we estimate the population size of the butterflies at the school to be around 60 individuals. However, this is only an estimate and there could be some sources of error or bias in the sampling method that could affect the accuracy of this estimate.
the streak plate technique works by using an inoculating loop to spread a bacterial sample in a pattern that thins it out but this only works if which of the following is done?
By dispersing the inoculation thinner and more uniformly with a fresh or sterilised loop, you can successfully dilute the mycelium on the surface and generate isolated colonies.
What is the streak plate method for bacterial isolation?The streak-plate method involves spreading a mixture of cells across the top of a semi-solid nutrient medium based on agar in a Petri dish so that decreasing numbers of bacterial cells are distributed at widely spaced places on the medium's outer layer and, after incubation, grow into colonies.
What makes the streak plate technique such a crucial tool when dealing with microbes?In microbiology, agar streaking plates are a crucial tool. They enable fungus and bacteria to develop distinct colonies on a semi-solid surface. These colonies may be utilized to identify the organism, clean the strain of impurities, and create a genetic clone that is 100% pure.
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How should the fossils in the sediment layers of earth appear if species have evolved over time?.
The fossils in the sediment layers of Earth appear as upper layers having more complex organisms than the lower layers which means option D is the right answer.
As the living progressed on nature Earth, the complexity of the species also increased and this was mainly to sustain the living conditions which were continuously changing for each species. The life on Earth was started in the form of bacteria which adapted and converted into reptiles, fishes and amphibians and finally the most complex organism mammal (human beings) were born.
So considering the order of chronology, if the organisms died and got submerged, it would be less complex organisms first in the lower layers and as life progressed and complex organisms began to die, they would form the upper layers on the Earth. Hence, complex organisms are the newest ones and will be found on the upper layers of sediments.
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Refer to complete question below:
How should the fossils in the sediment layers of Earth appear if species have evolved over time?
A. All of the layers should contain fossils of simple organisms.
B. All of the layers should contain fossils of complex organisms.
C. The lower layers should contain fossils of more complex organisms.
D. The upper layers should contain fossils of more complex organisms.
which of the following is the general term for the chemical substances that are secreted by the endocrine glands?
The general term for the chemical substances that are secreted by the endocrine glands is "hormones".
The specific defenses of the immune system include a variety of cells that circulate in the blood and that make up organs such as the spleen and thymus. How are the cells of the immune system able to differentiate pathogens from the cells of the body?.
Explanation:
The immune system is able to differentiate between pathogenic cells and normal cells of the body in a variety of ways. First, the cells of the immune system are able to recognize certain molecules on the surface of foreign cells that are not found on the body's own cells. These molecules, called antigens, can be proteins, carbohydrates, lipids, or nucleic acids. The immune system also has receptors that recognize these molecules, which allows them to identify and respond to foreign cells.
In addition, immune cells are able to recognize the shape and size of foreign cells, which is different from the shape and size of the body's own cells. The immune system also uses a process called phagocytosis, in which immune cells engulf and destroy foreign cells. Finally, the immune system can detect the presence of certain molecules, such as cytokines and chemokines, that are produced by foreign cells and can be used to identify and respond to them.
Overall, the immune system uses a variety of mechanisms to differentiate pathogenic cells from normal cells of the body. This helps the body recognize and respond to foreign invaders and prevents them from causing harm.
for labrador retrievers the dominant allele b for gene 1 leads to black coat while the recessive allele b leads to brown coat. alleles of gene 2 can change this color, with the dominant allele e having no effect but genotype ee changing either black or brown to yellow color. for dogs with the genotype bbee, the effect of gene 2 on gene 1 is . exam 1
The dog in question has the genotype bbee, the dominant allele B of gene 1 determines that it will have a black coat, and the dominant allele E of gene 2 has no effect on this, so the dog will have a black coat.
What is genotype?
Genotype refers to the genetic makeup of an organism, which is determined by the combination of alleles (alternative forms of a gene) inherited from its parents. An organism's genotype determines its observable traits, such as its physical appearance, behavior, and susceptibility to certain diseases or disorders.
Genotype is represented by a combination of letters that indicate the alleles of a gene that an individual possesses. For example, in the case of a gene with two alleles, A and a, an individual's genotype could be AA, Aa, or aa, depending on the specific alleles inherited from their parents.
For dogs with the genotype bbee, the effect of gene 2 on gene 1 is that it does not change the coat color. This is because the dominant allele E of gene 2 has no effect on the coat color determined by gene 1, while the recessive allele e of gene 2 only affects the coat color if the dog carries two copies of it (i.e. genotype ee).
Therefore, since the dog in question has the genotype bbee, the dominant allele B of gene 1 determines that it will have a black coat, and the dominant allele E of gene 2 has no effect on this, so the dog will have a black coat.
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you purchase a carton of certified organic eggs. which of the following is guaranteed by that label?
No antibiotics were administered to the hens. This is guaranteed by the label on a carton of certified organic egg.
Certification No added antibiotics, antibiotic-free production, and antibiotic-free upbringingYour best bet at the store is to purchase eggs that are both USDA Organic and bear one of two animal welfare-related seals, either Animal Welfare Approved or Certified. Our food system's use of humane antibiotics poses a serious threat to the health of both people and the environment. In your chicken or eggs, you don't want them. In theory, the Government does demand that manufacturers who use this word on egg cartons present proof that their chickens were grown without antibiotics. Unlike an organic certification, it does not have a well-developed system of checks and balances.For more information on animal husbandry kindly visit to
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Complete question : How to Read Food Labels, From Free-Range to Fair Trade (NPR, 3/10/2020)
You purchase a carton of certified organic eggs. Which of the following is guaranteed by that label?
this drainage pattern looks like the veins on the underside of a leaf or tree like is called: group of answer choices centripetal annular dendritic trellis
The drainage pattern that resembles the veins on the underside of a leaf or tree is called a dendritic pattern. A dendritic drainage pattern is characterized by a system of branching and converging streams that resemble the branches of a tree or the veins in a leaf.
What patterns are identified in leaves?There are many different types of patterns that can be identified in leaves, depending on the species and other factors. Here are a few examples:
Venation patterns: The veins of a leaf can be arranged in different ways, including pinnate (with one main vein and smaller veins branching off), palmate (with several veins branching out from a central point), and parallel (with multiple veins running parallel to each other).
Margins: The edge of a leaf can have different types of margins, such as serrated (with sharp, tooth-like edges), smooth (with a continuous edge), or lobed (with deep, curved indentations).
Surface patterns: The surface of a leaf can be smooth or textured, and may have bumps, ridges, or other patterns. Some leaves have a waxy coating or small hairs.
Shape: Leaves come in many different shapes, including oval, round, lanceolate (long and narrow), and heart-shaped.
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Give one reason why Mr. Anderson's heart rate changes between mile 2 and mile 3. Use the heart rate and elevation graphs as your resources.
HELP ASAP
Mr. Anderson's heart rate changes between mile 2 and mile 3 due to walking as a result of parasympathetic withdrawal.
What is heart rate?The number of heart contractions per minute, or heart rate, is a measure of how frequently the heart beats.
During exercising or in stressful, frightful, or thrilling situations, the sinus node sends a signal to the heart to beat more quickly. For instance, a brisk 10- to 15-minute walk usually causes the heart rate to increase to 110 to 120 beats per minute.
Thus, Mr. Anderson's heart rate increases between mile 2 and mile 3 due to walking.
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