| A | B |
|---|
| Paleoanthropologists | scientists who study human evolution |
| Anthropoids | a subgroup of primates made up of monkeys, apes, and humans |
| Opposable thumb | a thumb that can be positioned opposite the other fingers |
| Cranial capacity | the size of the brain case |
| Bipedalism | upright walking on two legs |
| Hominids | a subgroup of primates that includes human beings |
| Primate | a member of Primates, the mammalian order that includes humans |
| Extinct | a species dying off completely |
