Evolutionary biologists have found that different genes accumulate changes at different rates but that the rate for a particular gene is constant among different organisms. This is because
A. the DNA of some organisms mutates faster than the DNA of other organisms.
B. certain genes (and therefore certain gene products) can tolerate more mutations than others.
C. certain stretches of DNA are more likely to undergo mutations than others.
D. there are periods of very few mutations followed by periods of rapid mutation.
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