Why are mushrooms important to the food chain?
a. they recycle nutrients into the ecosystem.
b. they produce food energy for other living things.
c. they recycle oxygen into the atmosphere.
d. they consume excess herbivores in the ecosystem.

A. They recycle nutrients into the ecosystem.

Mushrooms are the decomposers which feed upon dead and decaying matter and return essential nutrients to the soil. This is called as nutrient recycling. They come in the phylum Fungi. In the absence of fungi, nutrients will not be recycled leading to the collapse of entire food chain.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.