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It is described as a process in which organisms reproduce and survive in diverse ways as a result of phenotypic alterations. It comprises a mild variation of a trait, which is retained if the variance benefits the individuals.

(a) When two sexes of the same animal have distinct features and sexual organ distinctions. Sexual dimorphism is a phenomenon that occurs in both animals and plants. It is the proper response.

(b) A sort of natural selection is sexual selection. In this selection, one member chooses and mates with the opposite biological sex, demonstrating fulfilment in the opposite sex selection. It's the incorrect response.

(c) In population genetics, disruptive selection is also known as diversifying selection, which describes how extreme values for a characteristic are preferred over intermediate values that vary. It's the incorrect response.

(d) A cline is a geographic gradient or average character value that gradually increases geographic variance by a gene's frequency. One of the causes for the development of clines is natural selection. It's the incorrect response.