Why are invasive species dangerous to the environment?
they pollute the environment.
they are always predators.
they threaten biodiversity.
they bring abiotic factors.

The correct answer is - They threaten biodiversity.

The invasive species are dangerous because they threaten the native species of the place where they are introduced. They are competing for the same niche in the food chain as some of the species, for the same food, or are predators from whom the local fauna can't defend or escape because they don't have the needed defense mechanism nor can develop it immediately.

The perfect example are the cats and the rabbits in Australia.  The cats became an apex predator that brought lot of native species on the verge of extinction, and even managed to totally destroy some species, while the rabbits compete with the local animals for the same food, but the rabbits have much faster reproductive system and are outnumbering their competition and thus pushing it slowly aside.

The answer is: they threaten biodiversity.

which are post-impressionist paintings? check all that apply?

explanation:

post-impressionism is a predominantly french art movement that developed roughly between 1886 and 1905, from the last impressionist exhibition to the birth of fauvism. post-impressionism emerged as a reaction against impressionists' concern for the naturalistic depiction of light and color.

hope this have a good day

not sure if this what   you'r looking for would be percent composition