A team of researchers from University of Cambridge, UK, and University of Tübingen, Germany, gathered over 300 fossils of the genus Homo from across the globe and measured the changes in the body and brain size over time. They cross referenced this data with the world’s regional climatic changes in the same years and came to the conclusion that climate, especially temperature, has played a major role in the changing size of the human body.
Their research also proved that larger body sizes exist in colder temperatures, as less heat is lost from the body, and vice versa. Compared to earlier human ancestors such as Homo habilis, the body size of the Homo sapiens is 50% larger and the brain is three times larger. This also proves that the human body and brain have continued to evolve.
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