 Biomolecule, a biomolecule or biological molecule is a loosely used term for molecules and ions that are present in organisms, essential to some typically biological process such as cell division, morphogenesis, or development. These include large macromolecules or polyanion such as proteins, carbohydrates, lipids, and nucleic acids, as well as small molecules such as primary metabolites, secondary metabolites, and natural products. The more general named for this class of material is biological materials. Biomolecules are usually endogenous but may also be exogenous. For example, pharmaceutical drugs may be natural products or semi-synthetic biopharmaceuticals per day may be totally synthetic. Biology and its subsets of biochemistry and molecular biology study biomolecules and their reactions. Biomolecules are organic compounds and just for elements oxygen, carbon, hydrogen, and nitrogen make up 96% of the human body's mass. But many other elements such as the various biometals are present in small amounts. The uniformity of specific types of molecules, the biomolecules and of some metabolic pathways as invariant features between the diversity of life forms is called biochemical universals or theory of material. Unity of the living being is a unifying concept in biology, along with self-theory and evolution theory.