Why do fish and frog produce a huge number of eggs each year?
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1. External fertilisation occurs in fish and frog.
2. The female lays a vast number of eggs in water and male releases some millions of sperms on to them in water.
3. Eggs may be carried to a long-distance by water currents or they may be eaten by predators.
4. So fertilisation is a chance factor and controlled by nature.
5. Fertilisation occurs externally hence it is inevitable to give rise to vast number of eggs by fish and frog.