Why do the abalones (a type of mollusk) rarely produce hybrids?
a. Various abalones have different mating and courtship behaviors.
b. Abalones do not coexist with individuals of other abalone species.
c. Abalones are ecologically isolated.
d. Their eggs and sperm fail to develop.
e. Abalone eggs are surrounded by a membrane that can be penetrated only by sperm containing a particular enzyme.
Ans: e. Abalone eggs are surrounded by a membrane that can be penetrated only by sperm containing a particular enzyme.
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