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A key reason that Amphibians must return to water for reproduction is that they do ________.

a. internal fertilization of their eggs
b. external fertilization of their eggs
c. asexual reproduction
d. binary fission

1 Answer

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A. External fertilization of their eggs

Explanation:
The reason that they have to return to water for reproduction is because unlike other tetrapod vertebrates (reptiles, birds, and mammals), amphibians do not produce amniotic eggs. Therefore, they must lay their eggs in water so they won’t dry out.
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