When did the following things happen during our evolution?

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      qwertyqwerty11294
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      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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