How can homo erectus and homo sapiens, at their times, migrate from africa to all over the world, including australia and americans? i mean, they can't swim hundreds of kilometers in the ocean, but they arrived anyway.

answer:

homo sapiens evolved from their early hominid predecessors between they all shared the trait of bipedalism, or the ability to walk upright on two legs. we can't be sure of the exact reasons humans first migrated off of the african ..

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