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(B) The two key concepts of Darwinism are Branching Descent and Natural Selection.$1.$ Branching Descent: Darwin proposed that all life forms share co

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(B) The two key concepts of Darwinism are Branching Descent and Natural Selection.$1.$ Branching Descent: Darwin proposed that all life forms share common ancestry,and evolution occurs through the branching of lineages.$2.$ Natural Selection: This is the mechanism by which organisms better adapted to their environment tend to survive and produce more offspring.$I$ and $II$ (Use and disuse of organs,Inheritance of acquired characters) are associated with Lamarckism.$V$ (Mutation) is associated with Hugo de Vries' Mutation Theory.$VI$ (Reproductive isolation) is a key concept of the Modern Synthetic Theory of evolution.

$I.$ 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

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$I.$ Use and disuse of organs$II.$ Inheritance of acquired characters$III.$ Branching descent$IV.$ Natural selection$V.$ Mutation$VI.$ Reproductive isolationThe two key concepts of Darwinism from the given options are