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9. Differentiate between internal fertilisation and external fertilisation.

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Internal fertilisation-

  • Fertilisation which takes place inside the female body is called internal fertilisation
  • survival chances of the offspring are more
  • animals including humans, cows, dogs and hens

 External fertilisation-

  • fertilisation in which the fusion of a male and a female gamete takes place outside the body of the female is called external fertilisation.
  • chances of survival of offspring are less
  • It is very common in aquatic animals such as fish, starfish, etc.
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