We know from the fossil evidence that bipedalism evolved before larger brains and other characteristics seen in modern humans. Scientists have come up with various hypotheses to explain why our ancestors initially became bipedal. Using the material in the textbook, summarize the hypothesis that you think best explains why bipedalism first evolved, and then explain why you think this hypothesis is the most convincing. Make sure to state precisely what scientific evidence you use to support your choice. Your initial post should be at least 250 words in length.