Which one of the following processes in the bodies of living organisms is a digestive process?

1. The question asks which process is a digestive process in living organisms. 2. Digestion involves the breakdown of complex food molecules into simpler molecules that can be absorbed and utilized by the organism. 3. Option (A): The Breakdown of proteins into amino acids is a key digestive process. Proteins are large polymers, and they are hydrolyzed (broken down) by enzymes (like pepsin, trypsin) into their constituent monomers, amino acids, which can then be absorbed. 4. Option (B): The Breakdown of glucose into CO₂ and H₂O describes cellular respiration, which occurs *after* digestion and absorption, to release energy. 5. Option (C): The Conversion of glucose into glycogen is glycogenesis, a process of energy storage, occurring after glucose absorption. 6. Option (D): The Conversion of amino acids into proteins is protein synthesis (anabolism), which uses absorbed amino acids to build the body's own proteins.