{quickly ! awarding 20 points } why are invasive species dangerous to the environment? check all that apply. they outcompete native species for resources. they compete for native mates and reproduce slowly. they cause harm to property that can cause economic loss. they disrupt food chains.

Explanation:

Invasive species are species that do not occur naturally in a given region, but have been brought to that region, usually by humans. This region has no natural predators for this species, which allows it to reproduce quickly, taking over the place and becoming a real pest. As a result, invasive species can outperform native species in competition for natural resources, cause destruction to the region causing damage to properties and even economic damage, in addition, they can interfere in food chains, preventing other organisms from feeding, or becoming predators invincible and uncontrollable.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.