Nitrogen-fixing bacteria live in protective nodules (bumps) on the roots of some plants. These bacteria are able to convert gase
ous nitrogen from the air into a form of nitrogen that the plants can use. Which type of relationship is this? A. mutualism
B. predation
C. commensalism
D. parasitism
Well, an element is a substance that cannot be decomposed into a simpler substance by chemical change, so element is the answer you are probably looking for! Hope this helps!
