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If a rival's sperm fertilizes an egg, then an opportunity to pass on your genes is lost. Tanzania to use drone network to deliver critical medicines. Evidence exists that illustrates the ability of genetically similar spermatozoa to cooperate so as to ensure the survival of their counterparts thereby ensuring the implementation of their genotypes towards fertilization. Copulatory plugs are frequently observed in insects, reptiles, some mammals, and spiders. This is called postcopulatory sexual selection and is a series of changes that take place in the sperm, and the female body. Only one sperm among all of the billions within her vaginal tract and uterus can win the prize of fertilizing the egg.
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