What is the result of successful communication between rhizobia and their plant hosts?
A. The rhizobia invade the plant root and begin to fix nitrogen with the assistance of the plant.
B. The plant consumes rhizobia as an energy source and carbon, destroying the invading bacteria.
C. The plant supplies organic forms of nitrogen to the rhizobia.
D. Rhizobia consume the plant tissue as an energy and carbon source, causing disease in the plant.
Answer: A
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