Answer: Survival of the fittest.
Survival of the fittest or Natural selection:
i. The organisms having favourable variations succeed in the struggle for existence.
ii. The organisms with unfavourable variations are unfit to survive and they perish.
iii. This means survival of the fittest.
iv. Nature selects the organisms with favourable variations and these are fittest to survive, hence, the theory is known as Theory of Natural selection.
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