(i) l c (ii) l+ (iii) l c (iv) l c (v) 1 c (vi) l+ (vii) l + + c + c ++ +c ++ + c ++ ++ ++ +c ++ ++ + c + c l c

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A:

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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.