When did the following things happen during our evolution?

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qwertyqwerty11294
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When did the following things happen during our evolution?

Post by qwertyqwerty11294 » Fri Jun 15, 2012 6:11 am

Referring to the tree, what letter(s) show the most likely time point or interval that the following has occured?
1. the first upright walking ape
2. early tool use: between C and D
3. symbolic representations/cave drawings

Also:
1. what is the approximate date of G?
2. what species is represented by F?
3. what is the approximate date of A?
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