Legumes, a type of plant, require Rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen. Rhizobia use the legumes for food. What would most likely happen to the legume population if Rhizobia suddenly became extinct?

Legumes depend on Rhizobia to fix nitrogen, which they need to survive. If Rhizobia became extinct, legumes would lose this essential source of usable nitrogen, so their population would most likely decline and eventually become extinct. The correct choice is “become extinct.”

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