Answer:
It is difficult to control invasive species because they have a high rate of reproduction, limited predators in the new ecosystem, and a generalist survival strategy.
Step-by-step explanation:
Invasive species tend to have high rates of reproduction, which means that even a few organisms released into the wild can quickly expand the population. Invasive species also have limited predators in the new environment. This prevents their population from being controlled naturally through the food web as it would be in their native environment. Lastly, invasive species tend to have a generalist survival strategy and are able to survive in a wide range of environments and eat a variety of prey species. This allows them to take hold in new environments, even if they are slightly different than their native ecosystem.