Protein; carbohydrate; lipid; nucleic acid; vitamin; and hormone. For information on the composition and performance in the cells that constitute the body, see Humans are generally diurnal, sleeping on typical 7 to 9 several hours on a daily basis. Childbirth is harmful, using a substantial hazard of complications and death. https://www.medchemexpress.com/2r-3r-2-3-dihydroxysuccinic-acid.html