You Observe Two Species of Amphibians Mating in a Stream

You observe two species of amphibians mating in a stream.Species A is engaging in external fertilization and species B is engaging in internal fertilization.In which species would recognition molecules on gametes be more critical?

A) Species A
B) Species B
C) Recognition molecules would be equally critical in both species A and species B.
D) Neither, because vertebrates do not need recognition molecules on their gametes.
E) There is insufficient information to make a determination.