Fill in the Blanks!

1) __ species - naturally originated in a given ecosystem and have become suited to the environment conditions there.

2) __ species - Species that migrate into an ecosystem or are deliberately or accidentally introduced into an ecosystem by humans.

3) __ species - nonnative species whose presence causes a decline in native populations. They outcompete native species because they have no natural predators or parasites in the new environment l, or they spread new diseases l.