Some biologists argue that each specific human trait must have arisen gradually and erratically, and that it is therefore difficult to isolate definite_____in the evolution of th.e species.
A.luctuations
B.generations
C.predispositions
D.milestones
E.manifestations
A.luctuations
B.generations
C.predispositions
D.milestones
E.manifestations
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