When did the following things happen during our evolution?

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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?