Why are invasive species dangerous to the environment?

C: they threaten biodiversity.

They don`t always pollute because they just eat or destroy things in the environment. (Thus "invasive")

Not all are predators. My state has an invasive form or blue reed river algae that kills fish.

Being nonrenewable is mostly irrelevant to the environment.

Hope that helps.

"d.) carbon dioxide and hydrogen sulfide"

what are the options