Arms That are Longer Than the Legs, and a Short

Question

Arms that are longer than the legs, and a short stable lumbar spine are traits associated with
A) brachiation
B) vertical clinging and leaping
C) arboreal quadrupedalism
D) terrestrial quadrupedalism
E) full-time bipedalism

Accepted Answer

Arms that are longer than legs are a characteristic of animals that primarily use brachiation, such as gibbons and some species of monkeys. The short, stable lumbar spine helps to facilitate the swinging motion required for brachiation.