External fertilisation and Internal fertilisation.
External fertilisation and Internal fertilisation.
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External fertilisation
1. The fusion of sperm and egg occurs outside the female body in external fertilisation.
2. It needs water or else the gametes will dry out and die.
3. Wastage of gametes is higher.
4. Mostly frogs (amphibians) and fishes shows external fertilisation.
Internal fertilisation
1. The fusion of sperm and egg occurs inside the female body in internal fertilisation.
2. It does not need water.
3. Wastage of gametes is lower.
4. Mostly reptiles mammals, birds and insects show internal fertilisation.
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