Answer:carrying an exotic species that could be harmful to North American ecosystems and damage it.
Step-by-step explanation:
Exotic species, refers to alien species or non indigenous species which invade a habitat which is not original theirs; which means they grow in a nonnative environment. They may get transported through animals or food or through the shipping industry.
These species are very dangerous to the natural species because they compete and deplete their natural resources such that natural species will become extinct in that area. They tend to become pests which destroys the natural habitat and the ecosystem of the natural species.