Which scenario describes a mutually beneficial relationship with fungi in an ecosystem? a) fungus growing inside an anthill. b) fungus growing on the leaves of plants. c) fungus used to make medications for humans. d) fungus used as food for human consumption

A) fungus growing inside an anthill.

Explanation: A mutualistic relationship is the one in which two distinct species live together in close association and both species recieves the benefits of association with each other.

Fungus growing in an anthill is the correct option because the ant use fungus as a source of nourishment. The ant recieves nutrients from the specialized hyphal tips called as gongylidia. In return the ant spreads the spores of the fungi on germination which form new colonies.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.