Bergmann’s rule
Bergmann’s rule is a principle in human ecology that states that individuals of a species in colder climates tend to have larger body sizes than those in warmer climates. This rule, named after the 19th-century German biologist Carl Bergmann, reflects an adaptation to thermal environments. Larger body sizes _______ ________ ________ ___ ____ _________ ___ ________ ____ ___.
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