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6.Evolution
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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 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 $VI$
Solution
Branching descent and natural selection are the two main concepts of Darwin.
Mendel's laws of inheritance and Weismann's theory of continuity of germplasm $(1892)$ discarded Lamarck's concept of inheritance of acquired characters
Standard 12
Biology
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