Question

Why do fish and frog lay more number of eggs where as cow and human beings
usually give birth to only one at a time?

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Answer 1

So, their large numbers enables adequate number of eggs to get fertilized even if some eggs are destroyed. In case of humans and others, the process of fertilization occurs inside the body.

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Answer 2

Explanation:

cause it get destroyed by Wind and water. this eggs are also eaten by any other animal or some of eggs are not fertile to grow so they lay many eggs from 1 million eggs only 99 or 100 eggs hatched. hope it will help you