Mutation. A mistake made while DNA copies which causes changes in DNA
For many species, there are often regional differences in their genes, although most of the time this differences aren't noticeable in their outward appearance.
Answer:
The answer would be D my friend.
Explanation:
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I believe the answer is C) is different lengths of time for different types of cells.
When we discuss superposition in biology term then its principle tells that one by one rocks or sediments settles.The superposition mean that the older rocks or sediments place below all newly coming sediments or rocks place on first layer so layer over layer formation is called superposition.
