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Gray, R. (2016, December 12). The real reasons why we walk on two legs, not four. BBC Earth. Retrieved from http://www.bbc.com/earth/story/20161209-the-real-reasons-why-we-walk-on-two-legs-and-not-four(Links to an external site.).

• Identify two of the theories for the origins of bipedalism that you consider to be the most plausible.
• Explain the theories clearly as well as why you believe they are most plausible.