Alien species that cause the most harm are those that

Options :
  1. struggle to fit into new ecosystems and eventually die out
  2. eventually become naturalised
  3. become invasive
  4. become agricultural products
Answer and Explanation :-

Answer: Option 3

Explanation:

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There is more in you of good than you know, child of the kindly West. Some courage and some wisdom, blended in measure. If more of us valued food and cheer and song above hoarded gold, it would be a merrier world.
-J.R.R. Tolkien The Hobbit