In the context of a population, how is evolution defined?
a. Evolution is a change in a population's allele frequencies over generations.
b. Evolution is the tendency for some individuals in a population to leave more offspring than others.
c. Evolution is the way in which sexual reproduction can rapidly spread advantageous traits throughout a population.
d. Evolution is the explanation for how organic molecules formed from inorganic molecules.
e. Evolution is always caused by natural selection.
Answer: a. Evolution is a change in a population's allele frequencies over generations.
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