| 1 | The first primates probably appeared about 70m years ago. | |
| 2 | Proportionally and compared to other primates, human males have | |
| 3 | Nim Chimpsky, to give him his full title, was born at the Institute for Primate Studies in Norman, Oklahoma, in the early 70s. | |
| 4 | Of these early primates, which is likely to have fashioned the tools found at Gona? | |
| 5 | But our primate relatives, such as chimpanzees, have the switch, and that's why they differ from us in these two ways. |