How do arbuscular mycorrhizae (AM) help plants obtain more nutrients from the soil?
A) By-products of AM metabolism serve as primary nutrient sources for the plants.
B) The AM increase the total surface area to absorb more nutrients.
C) The hyphae develop as specialized nodules that directly produce nutrients for the plant.
D) Signaling molecules in the plant are passed to the AM to initiate electron flow, which is in turn used to create ATP.
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