$I.$ Use and disuse of organs

$II.$ Inheritance of acquired characters

$III.$ Branching descent

$IV.$ Natural selection

$V.$ Mutation

$VI.$ Reproductive isolation

The two key concepts of Darwinism from the given options are

  • A

    $I$ and $II$

  • B

    $III$ and $IV$

  • C

    $V$ and $VI$

  • D

    $IV$ and $VI$

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