B. Carbon fixation begins the Calvin Cycle.
I think the statement “the human digestive system is very efficient at squeezing everything it can out of any food?" refers to the way the stomach is good at absorbing the wanted nutrients and keeping them in the body, while disposing of the unwanted waste and toxins. The biomolecules are broken down to preserve only certain nutrients within the molecules.
The equation is glucose + oxygen carbon dioxide + water and energy is produced in the form of ATP.
Explanation:
Cellular respiration is a metabolic process in which glucose combines with oxygen to produce carbon dioxide and water with energy stored as ATP.
Glucose + Oxygen gas → Carbon dioxide + Water + energy in ATP
ATP is Adenosine TriPhosphate.
In the body, during cellular respiration, oxygen gas is inhaled and carried to sites in the body where food in form of glucose obtained from plant is broken down.
When food is broken down aerobically i.e in the presence of oxygen gas, carbon dioxide and water is produced and energy is stored in form of ATP.
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