The two key concepts of Darwinian theory are natural selection and:
ABlocking descent
BBridging descent
CBranching descent
DBlending descent
Answer & Solution
Correct answer: C. Branching descent
1. Darwin's theory rests on two pillars.
2. Branching descent and natural selection are the two key concepts.
3. So the correct answer is branching descent.
_Source: NCERT Class 12 Biology, Ch 7 'Evolution'_
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