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i just don’t know what niche beer is. Can somebody explain please?

Which of the following best explains why an “exotic” species introduced into a new ecosystem often outcompetes the native species and forms a viable niche for itself?
1)
The exotic species has greater genetic diversity than the native species.
2)
The exotic species has few predators to slow its reproduction in the new environment.
3)
The native species are less equipped for changes that occur over time in the ecosystem.
4)
The native species cannot use the resources anymore once a new species arrives.

1)
A higher surface area-to-volume ratio facilitates heat loss.
2)
Animals in warmer climates need to move more quickly to catch prey.
3)
More species inhabit warm climates, and smaller size enables a greater number to live in the same ecosystem.
4)
Smaller body size enables faster reproduction and repopulation to maintain a niche in overpopulated warmer climates.