After which event would you say that evolution has occurred?

(A)
An animal's white winter coat is replaced by a darker coat in the spring.

(B)
An allele frequency in a population changes over time.

(C)
A new predator comes into an environment

(D)
An individual is born with six fingers on one hand instead of five.

A)

An animal's white winter coat is replaced by a darker coat in the spring.

Explanation: why bcz i said so

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