Which of the following is an enzyme? the moisture in clouds
the water in a teapot
the pepsin in one's stomach
the petal of a flower

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has

This is the interaction of two organisms where one is and the other is neither nor harmed.

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?