Question

mycorrhizae form a network of filaments that associate with plant roots and draw nutrients from the soil that the root system would not be able to access otherwise. this fungus - plant alliance stimulates plant growth and accelerates root development. this is an example of
mutualism
commensalism
parasitism
all of the choices are correct

Explanation:

Mutualism is a symbiotic relationship where both organisms benefit. Mycorrhizae - plant associations are mutualistic as the fungi help plants access nutrients and the plants provide the fungi with carbohydrates. Parasitism is when one organism benefits at the expense of the other. Commensalism is when one organism benefits and the other is neither helped nor harmed. Since both the mycorrhizae and the plants benefit in this relationship, it is mutualism.

Answer:

mutualism