Final answer:
Exotic or invasive species get established because they out-compete native species, introduce diseases to which native species have no resistance, and rarely have predators to keep their numbers in check.
Step-by-step explanation:
Exotic or invasive species get established because they out-compete native species, introduce diseases to which native species have no resistance, and rarely have predators to keep their numbers in check.
Learn more about establishment of exotic or invasive species