What is the ecological niche or role of the producer fungi- grass- shrub and tree?

Answer 1

all of the above listed are producers meaning the remove carbon dioxide to use to produce their own food while replacing the carbon dioxide with oxygen

only the grass, shrub and tree are producers-they convert sunlight energy into food so that the other consumers can obtain energy from the original source, the sun

fungi are decomposers-they must obtain their own food from dead/decaying matter