Digestion is the process by which the body breaks down food into nutrients that can be absorbed and used for energy and other bodily functions. It involves the physical and chemical breakdown of food in the digestive system, starting from the mouth and ending in the intestines. enzymes and acids play a crucial role in breaking down food into smaller molecules that can be absorbed by the body.
Feces is not considered to be a metabolic waste product because the digestive tract is open at both ends and technically, feces has never been inside the body. Feces does contain metabolic wastes, however, and the characteristic smell and color is caused by these metabolic wastes being broken down by the bacterial flora of the large intestine.
No. Fungi do not make their food. Things that make their own food are called "Producers" Plants are a producer, but Fungi are Decomposers, which means that they secret digestive juices on nearby life forms, and then they absorb that living thing's nutrients.