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postorbital bar
Yes all primates have a closed postorbital bar.
post orbital
Urban Youths
A clavicle, opposable pollex (thumbs), and forward-facing eyes.
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6 feet from post to post. And 4 feet from the bottom to the bar.
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All chimpanzees are primates but not all primates are chimpanzees. Humans, for instance, are primates.
If you mean "Are all mammals primates?" then the answer is no. Primates are a type of mammal. All primates are mammals. Not all mammals are primates. For example, cats, dogs, bears, rodents... these are all mammals, but not primates.
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yes, all and only primates primates have thumbs