AP BIOLOGY

Detailed explanation-1: -The common ancestors of all primates evolved an opposable thumb that helped them grasp branches. As the grasping hand evolved, claws disappeared. Today, most primates instead have flat fingernails and larger fingertip pads, which help them to hold on.

Detailed explanation-2: -Share on Pinterest Research indicates that primates with larger brains have better dexterity. A primate’s fingers endow it with the ability to feed itself and manipulate objects, including, for some species, tools.

Detailed explanation-3: -Primate features eye sockets with a ring or cup of bone surrounding and supporting the eyes. grasping hands with long fingers to curl around objects. opposable thumbs and/or big toes (able to touch the other digits on the same hand or foot) flat nails (rather than claws) on some fingers and toes.

Detailed explanation-4: -The hands and feet of all primates, except for humans, are designed for grasping. Humans have hands designed for grasping, but not feet! Humans have opposable thumbs. That means they can cross their thumb over to the opposite side of their hand and can touch their thumb to their fingers.