Which must be true for natural selection to occur?  Pick all that apply. 1. there must be an advantage to having one version of the trait over others 2. there must be variation in the trait 3. no other agent of microevolution can be occurring 4. it must happen randomly 5. there must be a small population 6. the trait must be heritable

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A: He was an english biologist,  best known for his contributions in the science of evolution.

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Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.