Many anthropologists assume that from around 3 million to 1 million years ago, the human evolutionary family consisted of two sharply contrasting lineages. The genus Homo adapted flexibly to new environments and ate a variety of foods, heralding the rise of people. In contrast, a big-jawed and relatively small-brained hominid known as Paranthropus consumed mainly nuts and other hard foods, causing it to die out as these resources became scarce in African habitats.
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