Answer:
Whether or not a given isotope is radioactive is a characteristic of that particular isotope. Some isotopes are stable indefinitely, while others are radioactive and decay through a characteristic form of emission. As time passes, less and less of the radioactive isotope will be present, and the level of radioactivity decreases. An interesting and useful aspect of radioactive decay is half-life, which is the amount of time it takes for one-half of a radioactive isotope to decay. The half-life of a specific radioactive isotope is constant; it is unaffected by coTnditions and is independent of the initial amount of that isotope.
Consider the following example. Suppose we have 100.0 g of tritium (a radioactive isotope of hydrogen). It has a half-life of 12.3 y. After 12.3 y, half of the sample will have decayed from hydrogen-3 to helium-3 by emitting a beta particle, so that only 50.0 g of the original tritium remains. After another 12.3 y—making a total of 24.6 y—another half of the remaining tritium will have decayed, leaving 25.0 g of tritium. After another 12.3 y—now a total of 36.9 y—another half of the remaining tritium will have decayed, leaving 12.5 g. This sequence of events is illustrated in Figure 15.1 “Radioactive Decay”.
Explanation:
what is th pH of Ascorbic acid
Answer:
l -Ascorbic acid is freely soluble in water (300 g/L at 20°C), difficult in alcohol (20 g/L at 20°C) and insoluble in chloroform, ether and benzene. It forms a clear colorless to slightly yellow solution. It has two pKa values: 4.2 and 11.6. The pH of a 5% (w/v) solution in water is 2.2–2.5 [9].
Explanation:
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l -Ascorbic acid is freely soluble in water (300 g/L at 20°C), difficult in alcohol (20 g/L at 20°C) and insoluble in chloroform, ether and benzene. It forms a clear colorless to slightly yellow solution. It has two pKa values: 4.2 and 11.6. The pH of a 5% (w/v) solution in water is 2.2–2.5 [9].
Which type of mutation does not change the amino acids produced?
Silent mutation: Silent mutations cause a change in the sequence of bases in a DNA molecule, but do not result in a change in the amino acid sequence of a protein (Figure 1).
Answer: Silemt Mutation
Explanation:
A-pex
Observed evidence that support the theory of evolution by natural selection includes
A Fossils, DNA sequences, and homologous structures.
Phenotypes, food preferences, and fossils
C Gene flow, mutations, and tropisms
D) Tropisms, genetic drift, and speciation
Explain how matter is cycled between plants and animals.
The food of come from autotrophic plant to animal through food chain. The energy cycles between the air and soil and plants, animals, and microbes occur by food web.
What are the components of food web?A food web is defined as the cyclical event of energy transfer among different trophic level of organism.
The major components are primary producers, primary consumers, secondary consumers, tertiary consumers, quaternary consumers
Primary producers are the green autotrophic plants and capture some of the solar energy and convert it into chemical energy by photosynthesis.
The net primary productivity (NPP) of energy is defined as the rate of photosynthesis minus the rate of respiration of plants.
Primary consumers or herbivores feed on producers constitute the second trophic level of the food web.
in third tropic level, Secondary consumers eat primary consumers where as tertiary consumers, quaternary consumers or predators, carnivores or omnivores, which are both plant- and animal-eaters, such as humans.
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I need help. Thanks!
Answer:
They bounce around and take form of the container
Explanation:
what is meant by the term VO2 max
Answer:
VO2 max is the maximum volume of oxygen you can consume per minute per kilogram of body weight at your maximum performance. VO2 max is an indication of aerobic fitness and should increase as your level of fitness improves.
Answer:
VO2 is the maximum oxygen uptake.
Explanation:
VO2 is the maximum oxygen consumption during incremental exercise.
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Answer:
it is C. Little to No agintation
Please help me on this history please I’m begging also it’s number one not number 2
Answer:
3 Or 2 I think?
Explanation:
So Sorry If It isn't right!
The production of another human organism is the function of which of the following systems?
Answer:
Reproductive System
Explanation:
The production of another organism is the function of Reproductive System
-TheUnknownScientist
Which of the following would produce the most similar offspring compared to the
parent organism?
The first option since it contains cells directly from the parent organism.
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What would most likely happen to plant cells if the plant was watered with salty water?
A. Water will enter the plant cells until the large central vacuole bursts
B. The plant's root will filter out the right amount of salt so the plant can remain isotonic.
C. Salt crystals will form on the leaves as water evaporates on the leaf surface.
D. Water would leave the large vacuole of the cell and the plant will droop.
Answer:
option D
Explanation:
the plant will lose water because water moves out of the cell and the vacuole will leave the cell
Water would leave the large vacuole of the cell and the plant will droop if it was watered with salty water.
What is Vacuole?This is referred to as an organelle within a cell that is empty of cytoplasm, lined with a membrane, and filled with fluid.
In cases where the plant is watered with salty water, osmosis takes place which involves water leaving the vacuole and the plant drooping thereby making option D the most appropriate choice.
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A healthy lifestyle is important because _______.
Answer:
A healthy lifestyle is important because it can help prevent chronic diseases and long-term illnesses.
Answer:
a.
people cannot control their genetic traits
Explanation:
just took the test
Explain how iron band formations are
evidence for the evolution of Earth’s
atmosphere.
Answer:
Photosynthetic organisms were making oxygen, but it reacted with the iron dissolved in seawater to form iron oxide minerals on the ocean floor, creating banded iron formations. ... The oxygen that is now in the Earth's atmosphere was not there at the beginning.
Explanation:
Band formations are thought to develop from cyanobacteria. It was developed as product of cyanobacteria photosynthesis.
What is the other name of cyanobacteria ?The other name of cyanobacteria is blue green algae.
The oceans must change between aerobic and anoxic situations. This characteristic makes banded iron development of direct indicators of oceanic oxygen levels, providing us with a data of Earth's oxygenation.
Banded iron formations are brought to have formed in sea water as the consequence of oxygen production by photosynthetic cyanobacteria. The oxygen joined with dissolved iron in Earth's oceans to form insoluble iron oxides which precipitated out forming a thin layer on the ocean floor.
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while mutation is random, natural selection is not. In your own words, explain how this is possible
Answer:
Mutation is a alteration in the DNA sequence in a gene during cell divison iwhere gene is coded mitakeny or due to the error. Mutatio is a random process as it can not be determind or known befor bthechange in sequence what gene or DNA would be effected by it or what genes would be transfer from the parents.
Natural selection is a process where some of the traits that are helpful in the surviving and increasing the number of individuals in a population and transfer from one generation to other according the adaption and change over the long timeline. Thus, it is not random and based on the traits that are helpful in a environment or for the survival of
which structure in a plant is at the same level of organization as a heart in an animal a. shoot system b. leaf c. chloroplast d. dermal tissue
Answer:
its actually D I just took the cumilative test on edgeinuity
Leaf in a plant is at the same level of organization as a heart in an animal.
What is leaf?"Like other organs leaf is comprised of three basic tissue systems, including the dermal, vascular, and ground tissue systems."Leaf is an organ as it consist different types of tissue.What do you mean by level of organization?"Levels of organization are structures in nature, usually defined by part-whole relationships, with things at higher levels being composed of things at the next lower level."There are five levels: cells, tissue, organs, organ systems, and organisms.What is heart?The heart is a pumping organ that is made of cardiac and connective tissue."An organ is a collection of tissues that structurally form a functional unit specialized to perform a particular function."
Hence, the correct option is b. leaf.
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Multiple sclerosis (MS) is a disease that affects the nerve cells of the brain and the spinal cord. Some of the symptoms of MS are chronic pain, pins-and-needles sensations, muscle weakness, and visual disturbances. Study the image, and then explain the cause for these symptoms.
Answer:
Nerve cells and axons are the way we transmit motor and sensory signals. The cells and axons are coated with myelin a.k.a.(myelin sheath) Myelin allows smooth transition of signals to and from motor and sensory pathways. In multiple sclerosis the myelin sheath is irreversibly damaged. The damage to the myelin interrupts the normally smooth transmission of signals. The damage leads to pins and needles sensations(paresthesias), muscle weakness secondary to poor motor signal transmission, vision is no different as the sensory signal is impeded from transmission secondary to lack of myelin sheath
Explanation:
Answer:
According to the image, the myelin sheath in a person with multiple sclerosis wears away. This damage hampers the ability of the nerve cells to transmit impulses as fast as they can. This inability results in symptoms such as visual disturbances. It also causes chronic, dull pain. These symptoms wouldn’t exist if the myelin sheath were intact. (this is the sample answer they gave me)
Explanation:
In order, what biomes would you see if you travel from the North Pole to the equator?
Answer:
hyutrimhl
Explanation:
hgxffcij vkivggcnpppppppppp
g Consider a culture medium such as mannitol salt agar (MSA) on which only gram-positive organisms such as Staphylococcus sp. Colonies can grow due to an elevated NaCl level. A yellow halo surrounds some colonies on the medium, indicating they are able to ferment the mannitol sugar, decreasing the pH and changing the color of a pH indicator chemical. This type of medium would be referred to as:
Answer:
Selective and differential medium
Explanation:
The type of medium described in the illustration would be referred to as a selective and differential medium.
There are basically 6 types of growth media for microbes based on the chemical composition of the medium;
Enrich media: media that are enriched by substances such as blood, egg, etc. E.g. blood agar.Basal media: media that can be used to culture organisms without the addition of any substance. E.g nutrient agar.Selective media: media that selectively favors the growth of one organism or a group of organisms over the others due to its contents. E.g. Mannitol Salt Agar, McConkey agar, etc.Differential media: media that has the potential to change color with respect to a particular organism. E.g Mannitol salt agar.Transport media: media that are used to transport organisms due to the fact that they cannot be cultured where they are collected. E.g Stuart mediumStorage media: media used to store organisms for future uses. E.g saline mediumMannitol salt agar has the capacity to favor the growth of a particular organism by indicating a color change. Hence, it is referred to as a selective and deferential medium.
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How is an occluded front different from a cold front?
a) Warm air is pushed up during an occluded front, while cold air moves quickly during a cold front.
b) Occluded fronts cause warm air to feel dry, while cold fronts cause ground temperatures to feel cooler.
c) Warm air moves slowly during an occluded front, while cold air is cut off from the ground in a cold front.
d) Occluded fronts cause rapid changes in weather conditions, while cold fronts cause widespread cloud formation.
Answer:
A cold front forms at the leading edge of the colder air mass the cold front can bring thunderstorm in the region whereas the occluded front can bring strong winds and precipitation. so its probably d
Occluded fronts cause rapid changes in weather conditions, while cold fronts cause widespread cloud formation. Therefore, option (D) is correct.
What are occluded fronts?Because of their different densities, large masses of warm air and cold air do not mix when they come into contact with one another. They instead organize themselves into a front that is typically hundreds of miles long. When a warm air mass is sandwiched in between two cold air masses, the result is a phenomenon known as an occluded front. The mass of warm air rises as the masses of cool air push against one another and meet in the middle. The warm air mass is occluded, which literally means "cut off," from the ground, and pushed upward, which causes the temperature to drop. These types of fronts are known to bring blustery winds and significant precipitation.
Occluded fronts typically develop near low pressure areas that have reached their mature state.
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Reaction: C.H1206+6 A_76_B_+ 6 H20 + energy
What is occurring in the reaction above?"
A. Light is converted into ATP
B. Glucose provides the energy to make ATP C. Glucose is created from ATP
D. Light is converted into glucose
Answer:
The answer is A. Light is converted into ATP.
(surface tension, cohesion, polar, hydrogen bonding).
Water molecules share the electrons unequally causing it to be a_____ molecule. This allows_____ to form
between water molecules. The water molecules join together
through the process of_____
The cohesive forces of water
allows a thin film to form called____. This allows
water striders to be able to walk on top of water.
I NEED HELP NOWW
Answer:
1. Polar 2. Hydrogen bonding 3. Cohesion 4. Surface tension
Explanation:
1. Water is a polar molecules due to the presence of unbalanced charges in its covalent bond.
2. This unbalanced charges causes the molecules to be polar and thus form hydrogen bonds with nearby molecules due to their opposite charges. The hydrogen atom carries the positive charge while the oxygen atom carries the negative charge. The opposing charges thus causes hydrogen and oxygen atoms in nearby molecules to be attracted to each other.
3. This attraction of the water molecules to each other is called cohesion. Cohesion is the force of attraction between similar molecules and this force of attraction is called a cohesive force.
4. Since the water molecules are attracted to each other due to a cohesive force, this cohesive force causes a thin film to form called surface tension. Thus, surface tension is the ability of the surface of a liquid to resist external forces due to cohesive forces in its molecules and thus form a thin film.
true or false , the mRNA codon UGG is the only codon that codes for the amino acid tryptophan
Answer:
true
Explanation:
Natural Bridge Cavern was formed by water that seeped into the soft limestone in central Texas. What is this process called?
Mechanical weathering
Chemical weathering
Deposition
Erosion
Answer:
Chemical weathering
Explanation:
Chemical weathering is the process when rain chemicals react with rocks and minerals. In this process, the rocks are weakened. This chemical happening provokes the chemical reaction in the rock or in the mineral.
Chemical weathering is a spontaneous process and it leads to a more stable state for natural materials under a given set of conditions.
RIGHT ANSWER GETS BRAINLIEST
Answer:
analyze the results
Explanation:
Answer:
Free point :D
Explanation:
PLEASE HELP ILL GIVE BRAINLIEST
Answer:
Glucose
Explanation:
Glucose is organic because it contains carbon. Glucose is C6 H12 O6
What is erosion?
OA) The breakdown and movement of material.
O B) Materials carried by a stream.
C) The breakdown of material.
OD) The movement of material from one place to another.
Clear selection
Answer:
A.
Explanation:
the process of eroding or being eroded by wind, water, or other natural agents
Protists are grouped together because they all look similar.
True
False
Answer:
True
Explanation:
What is the PURPOSE of meiosis?
A. to make sperm & egg
B. to make food from sunlight
C. to make new boy cells
D. to make fertilized eggs
Answer:
to make sperm& egg
Explanation:
to make sperm& egg
Which form of energy is used when
wind turbines turn to create
electricity?
E. light energy
F. thermal energy
G. sound energy
H. mechanical energy
Answer:
H. Mechanical energy
Explanation:
Mechanical energy is motion and the wind turbine is in motion by turning.
Wave energy causes sound energy and light energy
True or False
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