In the northern hemisphere, populations of mammals tend to be smaller in the south and gradually larger as you go north. This is an example of

Question

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This phenomenon is known as clinal variation, which refers to gradual changes in the frequency of traits or characteristics across geographic space. In this case, the trait is population size of mammals, which shows a gradual increase as you move northward in the northern hemisphere. Options A, C, and D are not relevant to this phenomenon.

In the Northern Hemisphere, Populations of Mammals Tend to Be