how did humans came to the Earth?
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Humans came into existence through the evolutionary process which began with an unknown single cell organism. The exact brachial pattern has not been fully discovered but enough is known of it to make high probability guesses and know at least the most probable path of development which began about 3 billion years ago.
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On the biggest steps in early human evolution scientists are in agreement. The first human ancestors appeared between five million and seven million years ago, probably when some apelike creatures in Africa began to walk habitually on two legs. They were flaking crude stone tools by 2.5 million years ago.
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