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X Which of the following must occur for speciation to take place?

A. A population must be physically separated into two or more groups.

B. Harsh environmental conditions must be imposed on a population.

C. Competition must occur between members of a population.

D. Some event must occur leading to two or more groups within a population that cannot interbreed.

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X Which of the following must occur for speciation to take place?

A. A population must...
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