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The early hominids foraged for food from the fallen fruits or roots on the ground Later with the development of their cognitive neural matrix then attempted to reach out and gather fruits upright.The hominids behavior to collect and palisade themselves in social security by quickly gathering food and returning to their group made them hold the food in their hands and improve the upright posture.Later when they had to use both hands to carry stones or a bigger hunted animal the upright position became the practical mode to walk on two legs. .

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Q: How did the primate's posture improve from walking on 4 legs to just 2?
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