Question

legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen. rhizobi use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct? become extinct learn to fix nitrogen benefit in the long run stay the same

Explanation:

Legumes rely on Rhizobia for nitrogen fixation to survive. If Rhizobia become extinct, legumes lose this essential symbiotic relationship. Plants can't quickly evolve to fix nitrogen (eliminating "learn to fix nitrogen"). Losing a key survival factor (nitrogen fixation) means they can't survive long - term, so they won't "benefit" or "stay the same". Thus, the legume population would likely become extinct.

Answer:

A. become extinct