Why do exotic species pose a threat to an indigenous ecosystem such as in a Lake or an isolated island in the Andamans?
1. Such species compete with the local or native species for food.
2. They may be predators of local species.
3. Such species may cause diseases in native species.
Select the correct answer code:
1. 1 and 2
2. 2 and 3
3. 1 and 3
4. 1, 2 and 3