Using a molecular clock, scientists are able to estimate the amount of time that two species have been evolving independently.
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This is a positive mutation, because the offspring will survive longer to reproduce. Their offspring will then carry the same genes passing it off to their offspring. The other color mice that did not blend into its environment will soon be extinct, leaving only the mice that can blend in.
Insulin is released into the blood when oxygen levels are low and blood glucose levels are high
