Answer:
c. When a species is transported, it leaves behind its predators and the diseases that previously kept its population in check. Therefore the species is able to grow to large and damaging numbers.
Explanation:
An invasive species is the species that is not native to the ecosystem in which that species has entered. Invasive species are responsible for the destruction of the ecosystem because they outcompete with native species and reproduce faster than them.
This happens because in the new ecosystem they do not have their natural predators which control their number and not the pathogens that cause disease in them. Therefore they grow exponentially and outcompete native species.