Answer:An invasive species are organisms that are not native to the ecosystem or either the environment and causes damage and harm to the ecosystem.For example a rabbit comes into a ecosystem and eates all of the plants,then the type of species of rabbit is going to damage and destroy the ecosystem habitat or foodwebs etc.
Explanation:The things is that invasive species damage the ecosystems by eating all of the food that is need for the foodwebs and organisms to maintain and balance the environment around them.Also the reason why invasive species causes a threat to the environment by damage organisms habitats and leading organisms to having a habitat to organinsms that are losing their habitat because of invasive species.