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Natural selection in a population leads to evolution when:

A. every new generation of the population is a new species.
B. an offspring does not have all the same traits as its parents.
C. an organism cannot reproduce because of a mutation.
D. allele frequencies of some traits change in the population.

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D) allele frequencies of some traits change in the population

Alleles can be phenotype (how they appear) and natural selection is when an organism changes in a way that helps them survive.

It can be the way their beaks are formed that gives them a better chance of catching food among other stuff (Darwin's investigation)
Or how they change their color to adapt to the sudden change in tree coloration (Pepper moths)

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