List 4 things humans and primates have in common.

A. Opposable thumbs

B. Depth perception

C. Maternal care

D. Large brains

Explanation:

Opposable thumbs --> Primates have opposable thumbs and refined hand and foot development . An opposable thumb is able to be moved opposite the fingers of the same hand in order to better grasp objects. This is an adaption for an arboreal, or tree-dwelling, lifestyle because it helps the primates have strong grips on the branches.  Raccoons, dogs, and other non-primate mammals do not have opposable thumbs. This means they cannot move the thumb opposite the fingers of the same hand to grasp things tightly. This is why your dog would have trouble holding and manipulating a small object like a door key with his paws.

Depth perception --> Primates have an increased reliance on sight and decreased reliance on smell, compared to other mammals.  The eyes are large and forward facing, which provides better depth perception. The nostrils are smaller in relation to the face than in many other mammals.

Maternal care --> Primates have a smaller litter size, longer gestation, and extended period of juvenile growth compared to other mammals.  Most primates have one or two offspring at a time. They also exhibit increased periods of maternal care for their young compared to that of other animals.

Large brains --> Primates have relatively large brains. Primates have larger brains, relative to their body size, than most other mammals.

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