The entire process by which an organism furnish itself with the essential materials needed for life processes such as energy production, growth, reproduction, secretion, storage and maintenance of the osmotic conditions and pH within its body
1. Synthesizing organic compounds from carbon dioxide and water using energy supplied by chemical processes involving oxidation of inorganic substances such as hydrogen sulfide, ammonia and iron
2. Chemoautotrophs are organisms that can undergo chemosynthesis
Process by which digested simple molecules from food are transported from the GI tract to the blood and finally distributed to the different cells in the body