Question

why is the number of eggs , laid by frogs at a time , much higher than those laid by a hen?

Answer 1

Hey Mate
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Here is your Answer
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The number of eggs laid by frogsat a time are much higher thanthose laid by a hen because of the following reasons:
1) We can see External fertilization in frogbut not in hen.
2) Due to external fertilization, the female frog lays a vast number of eggs in water & males releases millions of sperms on to them.
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Hope it will help
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Answer 2

because frog Lays egg into water where are many enemies who eats their eggs