It has been hypothesized that fungi and plants have a mutualistic relationship because fungi provide critical nitrogen for the plants' use. How do we know this happens? In experiments using radioactively labeled _____
A) nitrogen, plants acquired more radioactive nitrogen when they were associated with fungi
B) nitrogen, labeled nitrogen showed up in fungi when the fungi were with symbiotic with plants
C) nitrogen, when plants were associated with fungi, the plants could fix labeled nitrogen
D) proteins, plants transported labeled proteins to adjacent fungi
Answer: A
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