Biology, 20.09.2019 03:40 hdjsjshshsh

Which explanation is most likely the reason for the evolution of a larger brain in humans?
the size of the human brain increases the more it is used.
a larger brain allows humans to solve complex problems.
the size of the human brain has changed randomly over time due to mutations.
a large brain increases humans’ ability to fight and survive disease.

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Which explanation is most likely the reason for the evolution of a larger brain in humans?
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