Which of the following assumptions or observations is not part of Darwin's idea of natural selection?

Question

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Darwin's idea of natural selection includes the observations that populations produce more offspring than their environment can support, organisms compete for limited resources, and heritable traits that promote successful reproduction should gradually become more common in a population. However, he did not believe that whether an organism survives and reproduces is almost entirely a matter of random chance. Natural selection occurs based on the traits an organism possesses, how well those traits allow the organism to survive and reproduce in its environment, and how those traits are passed down to offspring.

Which of the Following Assumptions or Observations Is Not Part