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.
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.
Answer
Answer: 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.
Explanation: This describes the difference between punctuated equilibrium (Model A) with long periods of stability followed by rapid changes, and phyletic gradualism (Model B) with continuous, gradual changes.
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