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30 POINTS


Rhizobium is a bacteria that invades the root nodules of certain plants. These bacteria obtain nutrients from the plant cells and also fix atmospheric nitrogen so it can be used by the plants. Which statement describes the relationship between the two organisms?

AThe bacteria don’t harm the plants but benefit only themselves.
BThe plants harm the bacteria but benefit themselves.
CThe relationship benefits both the plants and the bacteria.
DThe association harms both the bacteria and the plants.