1. Tardigrade
  2. Question
  3. Biology
  4. Assertion: Natural selection is the outcome of differences in survival and reproduction among individuals that show variation in one or more traits. Reason: Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.

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Q. Assertion : Natural selection is the outcome of differences in survival and reproduction among individuals that show variation in one or more traits.
Reason : Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.

AIIMSAIIMS 2004Evolution

Solution:

Darwin believed that small and useful variations make some species more adapted to the changing environment than others. Out of heterogenous population, nature selects the best adapted individuals while less fit or unfit are rejected because the unfit ones fail to survive and reproduce. This was called natural selection by Darwin and survival of the fittest by Wallace.