Ten frogs live in a pond in your backyard, five are homozygous for an allele that results in dark skin, and five are homozygous for an allele that results in lighter skin. A drought occurs, killing three frogs with light skin alleles. The rest of the population breeds and produces the next generation of frogs. Did the frog population evolve?

Yes

Explanation:

The allele frequencies of light to dark alleles were 1:1 before the drought. After the drought the frequency of light to dark skin alleles became 3:5.

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the answer is:

carbon dioxide

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