Answer:
A mutation is a change that occurs in our DNA sequence, either due to mistakes when the DNA is copied or as the result of environmental factors such as UV light and cigarette smoke.
DNA is a dynamic and adaptable molecule. As such, the nucleotide sequences found within it are subject to change as the result of a phenomenon called mutation. Depending on how a particular mutation modifies an organism's genetic makeup, it can prove harmless, helpful, or even hurtful.
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It measures the oceans depth!
An epoch is longer than an era.
Troposphere.
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Answer:
One reason is that there was too much pressure in the bottom of the ocean, from all the water pressing together.
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Explanation:
