(D) Hugo de Vries, in his mutation theory, proposed that evolution is a saltatory process, which means it occurs through large, sudden, and discontinu

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(D) Hugo de Vries, in his mutation theory, proposed that evolution is a saltatory process, which means it occurs through large, sudden, and discontinuous variations.He described these mutations as being $random$ and $directionless$, unlike the small, directional variations proposed by Darwin.