It is a living thing because it has life in them.
Answer:i'm pretty sure its C: into cells
Explanation:
It is a protein and it functions in a red blood cell to help carry oxygen
Although amino acids may have other formulas, those in protein invariably have the general formula RCH(NH2)COOH, where C is carbon, H is hydrogen, N is nitrogen, O is oxygen, and R is a group, varying in composition and structure, called a side chain.