Question

Why fish and frogs lay thousands of egg but hens usually lay one egg at a time

Answer 1

Fish and frogs lay thousands of eggs at a time because other organisms eats their hundreds of eggs at a time. After sometimes, they are reduced to some eggs. Only some of them can survive and grow into adult.

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Answer 2

Frogs and fish mostly lay their eggs in water,larvae produced by them could  flow along with water so to protect their generation they have to lay thousands of eggs at a time while hens lay eggs on land,so they do not need to lay many eggs.

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