Answer:
less than 1%
Explanation:
The approximate percentage of the geologic time that humans have existed on the Earth since its origin is less than 1%.
The earth is about 4.6 billion years and much of its history has been without the present of human activities.
Hominis were the first human to appear on the surface of the earth. This was in the Miocene epoch which was about 6 million years ago. Compared to the age of the earth, this time lapse is very small and not up to 1%. Life first appeared on earth about 3.5billion years. Since then evolution has taken its due course to give what we have today.Enzymes are involved in important processes in the human body. Name one of these processes.
Answer:
they catalyses or speeds up a chemical reaction.
hope this helps.
1
Which of the following must be available for aerobic respiration to take place?
А
Hydrogen sulfide
B
Oxygen
C
Carbon dioxide
D
Nitrogen
Answer
it is B oxygen
What are the lines in leaves
Answer:
Veins – The blackish lines in the leaf blade are called veins. The largest black line is the leaf's single “midvein,” running from the petiole to the leaf tip, the smaller blackish lines branching off the midvein are “secondary veins”
What type of energy is formed when chemical bonds are broken?
A)Thermal energy
B)Chemical energy
C)Radiant energy
D)Light energy
Answer:
option A.thermal energy because if a bond breaks it loses energy in the form of heat which is thermal energy.
Explanation:
Answer:
ik im late but its chemical energy
Explanation:
Which of the following choices includes two structures that are found in plant cells, but not in animal cells?
A.) cell wall
B.) chloroplasts , ribosomes
C.) lysosomes, mitochondria
D.) cell wall, large central vacuole
Answer:
the answer is d hope this helps
Why does the cell complete DNA replication?
Answer:
The cell must replicated DNA because when the cell divides, the daughter cells must have identical copies of DNA. DNA replication occurs in the S phase during interphase of the cell cycle.
6. Efferent neurons sends impulses from the central nervous system to the
rest of the body. True or false
Answer: True
Explanation:
The role of afferent neurons is to send the impulses from the central nervous system (and its sensory input received) to the rest of the body.
Which type of respiration is the most efficient in producing ATP?*
O aerobic
O anaerobic
O fermentation
glycolysis
Answer:
lol it might be a estimate good luck its not the real answer its a estimate to the answer
Explanation:
Answer:
Aerobic respiration
Explanation:
Which of the following is an example of an anabolic pathway?
Answer:
the conversion of protein into amino acids
Explanation:
What is a catalyst and how do they help with the chemical reactions needed for metabolism?
Answer:
See explanation
Explanation:
A catalyst refers to any substance that increases the rate of a chemical reaction. A catalyst does not affect the equilibrum position rather it enables the system to attain equilibrum faster.
Biochemical catalysts increase the rate of biochemical reactions in the body. They enable the body to carry out certain important functions that are necessary for life.
1.
Water has the ability to store heat longer than other substances and moderate temperature. This
property allows water in cells to absorb much heat without changing. What benefit does this property
of water provide to organisms?
A. O It provides the ability to dissolve nonpolar compounds.
B.
It provides the appropriate catalyst for chemical reactions
C.
It allows organisms to maintain a stable internal temperature or homeostasis
D. It enables organisms to function with a higher cellular pH
Answer:
A.
Explanation:
Which procedure took the DNA from one sheep to produce a genetically identical lamb, named Dolly?
selective breeding
gene therapy
artificial selection
cloning
Answer:
Cloning
Explanation:
If you take DNA and make a genetically identical thing with that DNA it would be cloning
Answer
D cloning
Explanation:
i just took the quiz and made a 100
What information does the author use to support the point of view in "The Problem with Plastic" that is not included in "Make a Change: Alternatives to Plastic Straws"
Answer:
The environmental threat posed by the egregious amounts of plastic waste that have accumulated over the years, and that will likely continue to increase unabated.
The enormous amount of plastic waste that has collected over time and that will probably continue to grow unabatedly poses a hazard to the ecosystem.
What is point of view?A logical argument supported by substantial evidence is a scientific worldview. We need consider what science actually is in order to comprehend why.
Science is a subject that seeks to comprehend the natural world through methodical observation and experimentation.
Because it is a standardized process, the scientific method is significant. Because the steps in the scientific method are methodical, scientists carry out experiments in a predictable way. Thus, such tests may be conducted more widely.
"The Problem with Plastic" suggests that the massive amount of plastic garbage that has accumulated over time and that will likely continue to grow unabatedly poses a threat to the ecology. It is not mentioned in "Make a Change: Alternatives to Plastic Straws."
Thus, this is the meaning of the given quotation.
For more details regarding point of view, visit:
https://brainly.com/question/11983141
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can you please help? :((
Answer:
2nd one
Explanation:
Why did the researchers NOT tell the patients which pill they were given?
Answer:
where is the rest of the question
Explanation:
Humans do not go through photosynthesis, however it is still important to us. Why is it so important to us? Be specific.
Answer:
It is still important, because photosynthesis produces oxygen which is what we breathe.
Photosynthesis is also necessary to grow food, which is what we eat
Explanation:
How does DNA fit inside a cell?
What are some risk factors for cancer (list at least 5)?
Answer: Older age.
A personal or family history of cancer.
Using tobacco.
Obesity.
Alcohol.
Some types of viral infections, such as human papillomavirus (HPV)
Specific chemicals.
Exposure to radiation, including ultraviolet radiation from the sun.
Explanation:
7. Write the chemical formula for photosynthesis: using chemical symbols AND using words.
Answer:
The photosynthesis equation is written as:
Explanation:
6H2O + 6CO2 → C6H12O6 + 6O2.
In words it is written as:
the reaction of six water molecules with six carbon dioxide molecules yielding one glucose molecule and six oxygen molecules.
Hope this helped!
Pick one part of interphase in the diagram above and describe its function in the cell cycle. Explain why interphase is important before mitosis begins.
PLZ I WILL GIVE YOU BRAINLIEST
Answer:Girl we’re taking the same test But here’s what i put
The G1Phase
is an intermediate phase occupying the time between the end of cell division in mitosis and the beginning of DNA replication during S phase. Interphase is important before mitosis begins because DNA is duplicated during interphase before the cell undergoes mitosis, the amount of DNA in the original parent cell and the daughter cells are exactly the same.
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two importance of proteins in human
Answer:
Growth and Maintenance. Your body needs protein for growth and maintenance of tissues. Yet, your body’s proteins are...
Causes Biochemical Reactions. Enzymes may also function outside the cell, such as digestive enzymes like lactase and...
Acts as a Messenger. Some proteins are hormones, which are chemical messengers...
Explanation:
your welcome
11. Each of the dialysis tubes was labeled "10%". What does that mean?
12. Some tubes increased on mass, some had very little mass change, and others decreased. Using
knowledge of osmosis to explain this phenomenon. Be sure the explanation includes the words
hypertonic, hypotonic, and isotonic.
Answer: 11. 10% is the concentration of solutes, 12. Osmosis is the net movement of solvent through a membrane according to the concentration of the solution.
Explanation:
Osmosis is a phenomenon that explains the movement of a solvent through a semi-permeable membrane without expenditure of energy, where the movement is through simple diffusion.
The tonicity is the total concentration of all solutes in the solution. Then, when a solution has a few particles, it has a low osmolarity, while a solution with many particles has a hight osmolarity. But, when there are two solutions separated by a permeable membrane to water (and not to the solutes or particles) the solvent (water) will move from the lower osmolarity side to the higher osmolarity side (which means, water moves from a region of low concentration to a region of high concentration)
To compare osmolarity of solutions, we use the terms hypertonic, hypotonic and isotonic. This is done, for example, to compar the osmolarity of a cell with the osmolarity of the extracellular fluid around it. If the extracellular fluid has a lower concentration than the fluid inside the cell, it is hypotonic with respect to the cell. In this case, the solvent will go into the cell. If the extracellular fluid has a higher concentration than the fluid inside the cell, it is hypertonic and the solvent will leave the cell from the region of lower solute concentration to the region with more solutes. At last, an isotonic solution is when the extracellular fluid and the cell has the same osmolarity and there will be no net movement of water in or out of the cell.
Increasing on mass would mean that there has been a net movement of water into the bag, because the solution was hypotonic. A decreased on mass mean that there has been a net movement of water out of the bad, because the solution was hypertonic. And if there has been no change or a very little mass change, it means the solution was isotonic, the same osmolarity or concentration of solutes was found inside and outside the cell.
Taking into account the concepts of tonicity and osmolarity, we can explain the process of dialysis which is the process of separating molecules across a semi-permeable membrane in a solution by the difference in their osmotic pressure. It is a laboratory technique where a solution that has many types of different solutes, is put into a semi-permeable sealed dialysis bag, (such as a porous cellulose membrane). Then it is placed in a container with a different solution, or pure water (which has a lower osmolarity). Molecules such as DNA or proteins are larger than the diameter of the pore thereby they are retained within the dialysis bag. However, molecules that are small enough to pass through the pores, such as water, tend to move in or out of the dialysis bag in the direction of the lowest concentration. It is usually used to remove salt from a protein solution. Then, if a dyalisis tube is labeled as 10%, it means its solute concentration is 10% of to the total volume of the dialysis bag.
what is the first type of macromolecule that is broken down by enzymes in the human digestive tract?
Answer:
Fats are the first macromolecules that are digested by saliva in oral cavity as saliva have ability to emulsify fats and oils
Explanation:
plzzz give me brainliest
What is the primary Force that causes the Rock slide, slumping and soil creep? Will it hearttttt
Answer: Gravity is the main force responsible for mass movements. Gravity is a force that acts everywhere on the Earth's surface, pulling everything in a direction toward the center of the Earth. On a flat surface, parallel to the Earth's surface, the force of gravity acts downward.
Which compound that provides energy in cells is made in every tube where cellular respiration is occuring?
Answer:
ATP
Explanation:
Adenosine triphosphate, commonly known as ATP, is the chemical molecule that stores and provides/releases energy in cells. ATP is needed by the cells of every living organism and is obtained via a process called CELLULAR RESPIRATION.
Cellular respiration is the process whereby cells breakdown food molecules (sugar) to synthesize energy storing molecules called ATP. Hence, in every tube where cellular respiration is occuring, ATP is the produced molecule that provides energy.
Which kind of of electrical charge is found on a hydrogen atom of a polar water molecule? A. A negative charge, because of a covalent bond with oxygen B. A negative charge, because of an ionic bond with oxygen C. A positive charge, because of an ionic bond with oxygen D. A positive charge, because of a covalent bond with oxygen
Answer:
D. A positive charge, because of a covalent bond with oxygen
Explanation:
A water molecule contain both hydrogen and oxygen atom. Water is a polar molecule because it has positive electric charge in one of it's poles and negative charge on the other. The hydrogen is positively charged and the oxygen is negatively charged which are bonded by covalent bond. Hydrogen is positively charged because it cannot attract electrons strongly like oxygen which is positively charged. There is unequal sharing of electrons in water molecules and this is why oxygen is slightly negative and hydrogen is slightly positive.
why was this semester hard for you?
Answer:
because school is torture
Why does diuron cause coral to bleach
Simple answer:
When corals are stressed by changes in conditions such as temperature, light, or nutrients, they expel the symbiotic algae living in their tissues, causing them to turn completely white. Warmer water temperatures can result in coral bleaching. ... This is called coral bleaching. When a coral bleaches, it is not dead.
More in depth explanation:
Exposure to higher (100 and 1000 µg l-1) diuron concentrations for 96 h caused a reduction in ΔF/Fm¹, the ratio variable to maximal fluorescence (Fv/Fm), a significant loss of symbiotic dinoflagellates and pronounced tissue retraction, causing the corals to pale or bleach.
Hope this helped :)
How does mitosis differ from meiosis? A. Mitosis makes gametes, meiosis makes body cells B. Meiosis makes haploid cells, mitosis makes diploid cells C. Mitosis requires cytokinesis, meiosis does not D. Mitosis makes gametes and meiosis makes zygotes
Answer:
B
Explanation:
Mitosis carries out the process of asexual reproduction, produces two identical daughter cells and forms diploid cells. Meiosis carries out the process of sexual reproduction, forms four different daughter cells and makes haploid cells.
PLZ HELP WILL GIVE BRAINLIE AND STARS AND I WILL BE YOUR FRIEND
passive: doesn't require energy, from high to low concentration
active:requires energy, from low to high concentration
i dont know maybe
