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Key concepts of Darwinian theory are

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An Intiative by Sri Chaitanya

saltation and randomness of variation

inheritance of acquired characters, use and disuse of organs

genetic drift, gene flow

branching descent and natural selection

answer is D.

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Detailed Solution

Saltation, randomness variation are the concepts of De Vries theory.
Inheritance of acquired characters use & disuse of organs are the principles of Lamarckism.

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