The amino acids in a polypeptide chain are linked by peptide bonds. Once linked in the protein 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 protein backbone.
Answer:
aerobic
Explanation:
aerobic means using oxygen while doing a certain task such as running, biking, sprinting and swimming.
To only engage in sexual contact when using protection (:
