Which of the following best explains how the ecological conditions are likely to be different

Figure 1 compares two models of speciation, A and B.

Which of the following best explains how the ecological conditions are likely to be different in the two models?

(A) In model A the ecological conditions remain unchanged for long periods of time and then change drastically; in model B the ecological conditions change drastically from generation to generation.

(B) In model A the ecological conditions remain unchanged; in model B the ecological conditions change gradually over long periods of time.

(C) In model A the ecological conditions are changing drastically from generation to generation; in model B the ecological conditions remain unchanged.

(D) In model A the ecological conditions change gradually over a long period of time; in model B the ecological conditions remain unchanged for long periods of time and then change drastically.

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