Fungi that are saprophytes are an important part of the ecosystem because
they are the source of food for the secondary consumers
they are the decomposers and clean up all of the waste materialc
they are the producers
they are parasites on plants and animals

They are the decomposers and clean up all of the waste material.

Explanation:

Fungi are the saprophytic organisms which means they obtain their food from the dead and decaying organic matter generated by the decomposition of plants and animals matter in the soil. The fungal colonies grows over the decaying matter and helps in it's decomposition. This way the fungi act as biological cleaning agents which clean up the biological waste from the soil.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

because photosynthesis could not occur (apex)