Proteins. <span>The amino acids in a polypeptide chain are linked by peptide bonds. Once linked in the </span>protein<span> chain, an individual amino acid is called a residue, and the linked series of carbon, nitrogen, and oxygen atoms are known as the main chain or </span>protein<span> backbone.</span>
The role that they play is they break down dead plants and animals and waste(poop). This allows for plants to get nutrients in the means of fertilizer from what the decomposes break down. It also prevents from dead plants and animals piling up.
Septoplasty is the surgical procedure.