It is a measure of how acidic/basic a liquid is. The range goes from 0-14, with 7 being neutral. pHs less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
<span>1. Breathing moves air in and out of the lungs.
2. Oxygen diffuses from alveoli in the lungs into capillaries.
3. Oxygen enters red blood cells, where it binds to the protein hemoglobin.
4. Oxygen diffuses from the blood to the body's tissues, and carbon dioxide diffuses from the tissues to the blood.
5. Carbon dioxide leaves the body when exhale.</span>
I think it is D) Both processes involve energy transformations
hope this helps:)
