Final answer:
Primate traits refer to the unique characteristics of hands and feet found in primates, including five digits, nails, and opposable thumbs. These adaptations allow primates to climb trees and perform precise tasks.
Step-by-step explanation:
Primate traits refer to the unique characteristics of hands and feet that are found in primates. These traits include five digits (fingers or toes) on each hand or foot, with nails instead of claws. The most distinctive feature is the presence of opposable thumbs (and in some species, opposable big toes) that can be brought into opposition with the other digits, allowing both a power grasp and a precision grip.
These adaptations are necessary for primates to climb trees, as they all descended from tree-dwellers. In addition to the opposable thumb, other adaptations include a rotating shoulder joint, a widely separated big toe (except in humans), and stereoscopic vision. These traits enable primates to grip branches and swing through trees, making them well-suited for an arboreal lifestyle.