The correct answer is option C. "The protein would become denatured due to the acidic environment".
Explanation:
Under acidic conditions the ionizable groups of the amino acids of the proteins are ionized due to the high protons content. This condition cause that protein lost its native structure and become unfolded and denatured. The acidic environment of the stomach will have this effect on the gram of proteins that have the Yummie cake, becoming denatured once it passes through the stomach.
The Respiratory system allows the entry of oxygen into the body and releases Carbon Dioxide. The Oxygen travels across lung tissue into blood vessels and the blood carries the oxygen around the body. Thus the Respiratory and Circulatory systems work together in gas exchange which is vital in Homeostasis.