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They lay eggs in water.These eggs do bot have any hard layer.So,they are very delicate.Many of the aquatic animals also consume these eggs.So, a large amount of eggs get destroyed.
Now male frog also produce sperms in a large amount in water.So, to ensure fertilisation of a few of them they lay eggs in large numbers.....
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By producing lots of eggs, there is a better chance of the species surviving.

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