Compared with the nearest evolutionary relative, thechimpanzee, the human has a brain that is huge. At a pointin the past, a common ancestor gave rise to the two speciesof humans and chimpanzees. That evolutionary history islong and is still an area of intense study. But somethinghappened to increase the size of the human brain relativeto the chimpanzee. Read this article(http://openstaxcollege.org/l/hugebrain) in which theauthor explores the current understanding of why thishappened.According to one hypothesis about the expansion of brainsize, what tissue might have been sacrificed so energy wasavailable to grow our larger brain? Based on what youknow about that tissue and nervous tissue, why would therebe a trade-off between them in terms of energy use?

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