Question

explain what are the advantages of cross-fertilization in earthworms in relation to the number and characteristics of the offspring obtained

Answer 1

Cross-fertilization, also called Allogamy, the fusion of male and female gametes (sex cells) from different individuals of the same species. Cross-fertilization must occur in dioecious plants (those having male and female organs on separate individuals) and in all animal species in which there are separate male and female individuals. Even among hermaphrodites—i.e., those organisms in which the same individual produces both sperm and eggs—many species possess well-developed mechanisms that ensure cross-fertilization. Moreover, many of the hermaphroditic species that are capable of self-fertilization (q.v.) also have capabilities for cross-fertilization.

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