8) Each of the observations provides evidence that supports the idea of common ancestry and evolution.   Which one is from the field of molecular biology?   A) Mammals have two openings in the skull behind each eye socket, whereas reptiles and bird only have one opening.   B) DNA analysis shows that the DNA of Neanderthals is more similar to the DNA of non‑African humans than that of Africans.   C) Two closely related but distinct species of squirrels inhabit the north and south rims of the Grand Canyon.   D) The embryos of both birds and mammals divide in a radial cleavage pattern instead of a spiral cleavage pattern present in insects.

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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.