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13 October, 20:51

Which of the following groups of animals only uses internal fertilization?

mollusks

amphibians

fishes

mammals

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  1. 13 October, 21:15
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    I think the correct answer from the choices listed above is the last option. It is the mammals the groups of animals that only uses internal fertilization. Internal fertilization is the union of an egg cell with a sperm during sexual reproduction inside the body of a parent. Hope this answers the question. Have a nice day.
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