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Question Question 9
Differentiate between internal fertilisation and external fertilisation.
| Internal fertilisation | External fertilisation |
|---|---|
| It takes place inside the body of female. | It occurs outside the body. |
| It is observed in human beings and other animals such as hens, cows and dogs. | It is observed in aquatic animals and amphibians such as fish, starfish and frogs. |
| Lesser number of eggs are released. | Many more eggs are released. |
| Survival rate is higher. | Survival rate is low. |