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In most marine vertebrates (fish), physical copulation does not occur; ... ...

In most marine vertebrates (fish), physical copulation does not occur; instead, eggs and sperm are simply released into the water, where they can meet and fertilization may occur. Humans have various blocks to polyspermy, and fishes have similar mechanisms to prevent fertilization of an egg by more than one sperm. In addition, their method of fertilization probably requires:
(A) The release of far greater amounts of eggs by females.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 18. Reproductive Systems, Gametogenesis, and Early Development

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