Proteins are biological polymers constructed from amino acids joined together to form peptides. These peptide subunits may bond with other peptides to form more complex structures. Multiple types of chemical bonds hold proteins together and bind them to other molecules. Take a closer look at the chemical bonds responsible for protein structure.
Commensalism :)
in case when bacteria and human, both are benifited.
Answer:
C. Regulate how much carbon dioxide a country can emit
I believe the answer is B. Homoiothermal
