what does the root distribution whithin the prairie ecosystem cause?

answers:
the fertile soil underground.
food for bacteria and organisms.
the variety of grass species.
all of the above are correct

All of the above are correct. The root distribution within the prairie ecosystem causes the fertile soil underground by adding organic matter and nutrients, it provides food for bacteria and other organisms through root exudates, and it also contributes to the variety of grass species by allowing for different forms of competition and adaptation.