2009, Ronald J. LeBlanc, Peter Matthews, Roland P. Richard, Global Atlas of Excreta, Wastewater Sludge, and Biosolids Management, page 24:
Human excreta are made up mostly of urine and excrement that include diverse complex molecules derived from foods and bodily processes – carbohydrates, sugars, fats, etc.
使用する際の注意点
Although strictly a plural noun, in practice the word is occasionally used as if it were an uncountable noun.