In observing an unusual new fish,you see the male come very close to the female and insert a specialized fin into a place where eggs emerge in other fish,leading you to guess that these fish have evolved internal fertilization.

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The insertion of a specialized fin into a place where eggs emerge in other fish is a common behavior among fish with internal fertilization. This suggests that the observed fish have likely evolved internal fertilization as well.

In Observing an Unusual New Fish,you See the Male Come