A large hillside has been eroding over the years and has become a problem. Uncertain which plant species would best be able to survive and reduce erosion, ecologists decide to plant a variety of natural prairie grasses instead of a single type of grass. Using a variety of grasses in the hope that at least one of them will prosper and reduce erosion illustrates .

      n

the answer is c. altitude. hope this ! #brainiac

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )