The sexual reproductive units produced by mature individuals of sexually reproducing species of organism is...

Explanation

In sexual reproduction, organisms produce special cells called gametes which are used to unite with the opposite sex to form a new individual. These gametes are produced by mature individuals of sexually reproducing species. The question is asking for the name of these sexual reproductive units. The options given are sperms, ova, zygotes, and gametes. Sperms are the male gametes produced by males while ova are the female gametes produced by females. Zygotes, on the other hand, are the cells formed as a result of the fusion of gametes during fertilization. Therefore, the correct answer to this question is option D: gametes. Gametes are the sexual reproductive units produced by mature individuals of sexually reproducing species of organism. It is important to note that gametes are haploid cells, meaning they contain half the number of chromosomes compared to the somatic cells of the organism. This is important because during fertilization, when two gametes fuse, the resulting zygote will have the normal number of chromosomes of the species. Overall, gametes are essential for sexual reproduction as they are the cells that unite during fertilization to form a new individual with a unique combination of genetic material from both parents.