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'Alien species invasion leads to extinct...

'Alien species invasion leads to extinction of indigenous species' - Justify this statement by considering two animals as examples.

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Nile perch introduced into Lake Victoria in East Africa led extinction of more than 200 species of Cichlid fishes.
IIIegal introduction of African Cat fish Clarias gariepirtus for aqua culture threat to the indigenous Cat fishes of our rivers
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