The greatest drawback of Darwin’s theory was his failure to explain ___.

variations

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survival of the fittest

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over production

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struggle for existence

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Solution

The correct option is A variations
Darwin believed that variations are an important factor for evolution. However, he couldn't recongnize the source of variations in the organisms. He did not know about the mechanism of inheritance.

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Similar questions

The first scientist who proposed his theory for the evolution was

(a) Darwin

(b) Mendel

(d) Wallace

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