Why might introduction of exotic species disrupt and ecosystem?

Why might introduction of exotic species disrupt and ecosystem?

Answers

Exotic species do not have a niche in the ecosystem that they are in. Therefore they take up resources that native species rely on to survive. Exotic species also have no natural predators in that environment causing them to flourish and multiply quickly. 

D. They can outcompete native species.

Exotic species are the species which are not native to the region to which they are introduced. They can be referred as alien, non indegenous species. These species are introduced either due to human intervention in order to use these species for their own benefit or these species migrate from their native land in search of food and other resources. These species may act as an invasive species, which means they compete with the native population for resources. Therefore, they will disturb the natural biodiversity of the ecosystem.

Hence, exotic species when introduced in an ecosystem they can outcompete native species.  

D. They can outcompete native species.
Exotic species might endanger the natural ecosystem of the place where they would be introduced by changing the food chain, or over multiplying, or anything similar.
Exotic species might endanger the natural ecosystem of the place where they would be introduced by changing the food chain, or over multiplying, or anything similar.
If the exotic species has no natural predators, it can consume all the prey and go unchecked by a predator. They could dominate the food chain pushing out native species.

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