difference in tonality for species of fish that fertilize internally.

Amphibians

Most amphibians utilize external fertilization, however, there are some exceptions, such as the salamander. Salamanders mainly utilize internal fertilization. Salamanders do not copulate because the male salamander does not have an external penis. Rather, the male salamander produces an encased capsule of sperm and nutrients called a spermatophore. The male deposits a spermatophore on the ground, and the female

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