How Might Brain Shape Reveal Clues About Hominin History

How might brain shape reveal clues about hominin history?

A) The globe-shaped brain of modern humans may result from enlargement of parts that are involved in speech.
B) The elongated brains of Neanderthals may reveal that their language capacity was less developed than that of modern humans.
C) Only brain size can give scientists clues about cognitive ability.
D) a and b
E) none of the above

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