Any cell-metabolism related waste product can be loosely classified as excreta. But undigested food,which is a part of faecal matter, should not be called as excreta. However, faecal matter contains a very small amount of salts of heavy metals like Mercury,Lead etc. which are produced by cell metabolism. So faecal matter can loosely be classified as excreta.
Excretion is the process of removing metabolic waste products from the body, such as urea through the kidneys. Egestion, on the other hand, is the removal of undigested food materials from the digestive tract, typically in the form of feces.
Bile
Excretion is the process of removing waste products from the body, while egestion is the process of expelling undigested food materials from the body. Excretion involves the removal of metabolic waste, such as urine and carbon dioxide, while egestion involves the removal of indigestible materials, such as fiber and cellulose.
No, excretion is the process of removing waste products from the body, while defecation specifically refers to the elimination of solid waste (feces) from the digestive tract through the anus. Defecation is a type of excretion, but not all excretion processes involve defecation.
Feaces
Egestion is the discharge or expulsion of undigested material (food) from a cell in case of unicellular organisms, and from the digestive tract via the anus in case of multicellular organisms. It should not be confused with excretion, which is getting rid of waste formed from the chemical reaction of the body, such as in urine, sweat. Egestion:- Removal of undigested food or faeces from the gut. In most animals egestion takes place via the anus, although the invertebrate flatworms must use the mouth because their gut has no exit. Egestion refers solely to indigestible matter which is never absorbed into the cells - it should not be confused with excretion of the waste products of metabolism. Excretion is the transfer of substances out of a living organism into its environment. At its simplest, for single-cell forms of life, this involves extrusion across the cell membrane of the unwanted or potentially toxic by-products of respiration and metabolism. This is also what is happening continually in the individual cells of the animal body, but from their immediate environment substances must move into the blood to be carried away to the site of their ultimate disposal. In the animal body there is also another type of excretion: expulsion of the residue of substances which have not been absorbed into the body proper from the gut (which can be considered a tunnel through the body of the external world).
Elimination is the removal of undigested food (solid waste) from the body.
Undigested food
Undigested food leaves the Paramecium through a structure called the anal pore, which serves as the organism's anus. The anal pore is located at the posterior end of the Paramecium and allows undigested food particles to be expelled from the cell.
Water in the undigested food will not be absorbed and the undigested food will be watery
Organisms get rid of waste through processes such as excretion, respiration, and egestion. Excretion involves the removal of metabolic waste products from the body, while respiration eliminates carbon dioxide. Egestion is the process of expelling undigested food materials.
It can be called that in very broad terms. Excretion involves sweat and urination as well.