The key criterion used by paleoanthropologists in deciding whether a gracile fossil younger than 2 million years of age should be placed in the genus Homo is
A) size of molars.
B) cranial capacity.
C) presence of a U-shaped dental arcade.
D) two premolars instead of three.

Question

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Paleoanthropologists often use cranial capacity as a key criterion to determine if a gracile fossil should be classified under the genus Homo, as it is indicative of brain size and cognitive abilities associated with early humans.

The Key Criterion Used by Paleoanthropologists in Deciding Whether a Gracile