Humans Homo sapiens are a species of highly intelligent primates. They are the only extant members of the subtribe Hominina and—together with chimpanzees , gorillas , and orangutans —are part of the family Hominidae the great apes , or hominids. Humans are terrestrial animals , characterized by their erect posture and bipedal locomotion ; high manual dexterity and heavy tool use compared to other animals ; open-ended and complex language use compared to other animal communications ; larger, more complex brains than other primates; and highly advanced and organized societies. Several early hominins used fire and occupied much of Eurasia. Early modern humans are thought to have diverged in Africa from an earlier hominin around , years ago, with the earliest fossil evidence of Homo sapiens also appearing around , years ago in Africa.
22.3 Half Life and Radiometric Dating
Radiometric dating - Wikipedia
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Difference Between Relative Dating and Radiometric Dating
Why use ice cores? How do ice cores work? Layers in the ice Information from ice cores Further reading References Comments. Current period is at right.
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