Radioisotope - An unstable form of an atom that may decay over time (1), Ardipithecus radius - The first hominid like primate that was not a hominid (2), Hominid - A collective name for all members of the genus homo (1), Opposable thumb - A defining feature of primates used to grip objects (2), Binocular vision - A defining feature of primates related to how we see (2), 5730 - The half life of C14 (number), Half life - The time taken for half the unstable atoms to decay into another element (2), C14 - An unstable form of carbon (1), Potassium - An element that can be used in relative dating (1),

Human Evolution D3i

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