explain alien-species invasion??

@ Sanjeev : Abhirami is right. You can refer to her answer. I would like to add some information related to it.

The unintentional or deliberate introduction of alien species causes the declination of the indigenous species. Example − Nile perch introduced in Lake Victoria led to the extinction of more than 200 species of cichlid fish in the lake.

@ Abhirami : Good work. Keep posting!!

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Plants, animals and other living things that have been introduced to a place where they have not lived before are known as 'invasive species' or 'introduced species'.

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