Amino acids are the building blocks of proteins and are made from basic amino group (−NH2) and an acidic carboxyl group (−COOH) as well an organic R group (or side chain) that is unique to each amino acid. they are made from carbon, hydrogen, oxygen and nitrogen atoms
The cliellum is located on the anterior end of the earthworm. The anterior end of the earthworm is used in mating, and the mouth and brain are also located in the anterior end.
