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Conversely, there are also species in which there is no sexual specialization, and the same individuals both contain masculine and feminine reproductive organs, and they are called hermaphrodites. The reason for the evolution of sex, and the reason(s) it has survived to the present, are still matters of debate.

Physical differences are often associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.the malaria parasite) also engage in sexual reproduction.Some bacteria use conjugation to transfer genetic material between cells; while not the same as sexual reproduction, this also results in the mixture of genetic traits.The defining characteristic of sexual reproduction in eukaryotes is the difference between the gametes and the binary nature of fertilization.Multiplicity of gamete types within a species would still be considered a form of sexual reproduction.

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