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Internal Fertilization- Internal fertilization is the union of an egg cell with a sperm during sexual reproduction inside the body of a parent.

(I am so sorry i don't know the meaning of internal development)
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hope it helped!
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The Brainliest Answer!
Internal fertilization is fusion of male and female gametes inside one's body
Internal development is development of foetus inside one's body like in humans
Hope it helps u
Good luck
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