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An island is inhabited by a population of lizards that come in two color phenotypes: blue or yellow. Color is an inherited trait. A hurricane hits the island and coincidently kills all of the yellow lizards. Subsequent generations in this population are composed entirely of blue individuals.

Which of the following processes is responsible for this evolutionary change?

A

Gene flow.

B

Natural selection.

C

Genetic drift.

D

Artificial selection.

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