ANSWERS: 1
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Homo erectuses (Neanderthals) and Homo sapiens (modern Humans) evolved a higher temperature level in the brain than our primate counter part did through fluke of nature. This produces more energy in hte brain allowing a higher level of activity and thought to allow us to understand how tools will benefit us. So other animals, primates, have a certain level of activity which allows for tool use but not enough for highly developed tools.
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