Which one of the following changes involved is irrelevant in the evolution of man? (A) Perfectio...

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Which one of the following changes involved is irrelevant in the evolution of man?
(A) Perfection of hand for tool making.
(B) Change of diet from hard nuts and hard roots to soft food.
(C) Loss of tail.
(D) Increase in the ability to communicate with others and devel op community behaviour.
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