Body size varies among human groups. This variation may be caused in part by

Question

Quizplus · Accepted Answer

Body size variation among human groups is likely a result of natural selection. Different groups may have evolved different body sizes in response to environmental factors such as climate, altitude, and food availability. For example, individuals living at high altitudes may have evolved larger chests to support larger lungs for better oxygen intake, while those in colder environments may have evolved shorter limbs to conserve body heat. This suggests that selection, rather than other factors listed, is the most likely cause of body size variation.

Body Size Varies Among Human Groups