There is several reasons why early humans started to walk ton two feet.One reason is that they didn't have balance on two foot. Another one is that they couldn't see the front or around and they needed that to be aware of what was happening near them. The third reason is that they could move faster and escape from danger much more easier. Also a reason is that they collected food this way because they could see where to search and find food.
The reason that I found that was most realistic for me was that they collected food on two feet because they needed food and it was easier on a biopedal position.
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