Answer:
In biology, a molecular clock can be described as a method to determine the time for the divergence of species which occurred by the process of evolution.
Explanation:
The mutation rates of different molecules are used in this method. The mutation rates for DNA sequences and amino acid sequences are usually considered. The molecular clock can be used to compare and estimate the splitting of a lineage. For example, by this method, one can interpret when the chimpanzees and humans diverged from each other.
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-Toshino
It radiates light and heat, or solar energy, which makes it possible for life to exist on Earth. Plants need sunlight to grow. Animals, including humans, need plants for food and the oxygen they produce. Without heat from the sun, Earth would freeze.
Answer:
Catalysts are substances that increase or decrease the rate of a chemical reaction but remain unchanged. Enzymes are proteins that increase rate of chemical reactions converting substrate into product.
Explanation:
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Answer:
1) Light energy enters the chloroplasts of plant cells.
2) Light energy is converted into chemical energy in the form of sugar.
3) The chemical energy in sugar is used immediately for life processes.
4) Excess sugar is converted to starch and stored by the plant until needed.
Answer:
D
Explanation:
A sperm having half the normal species number of chromosomes
