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Fecundation in chondrichthyes and osteichthyes

How dissimilar are fecundation in chondrichthyes and osteichthyes?

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In chondrichthyes fecundation is interior by means of copulation. In osteichthyes fecundation usually is external and the gametes are liberated in the water, where they can fecundate their complement and form the zygote.

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