Question

5.) what is breathing? how is breathing related to cellular respiration?

Explanation:

Breathing is the process of inhaling oxygen - rich air and exhaling carbon - dioxide rich air. It supplies oxygen to the body and removes carbon dioxide. Cellular respiration is the process in cells that uses oxygen to break down glucose and release energy in the form of ATP. Breathing provides the oxygen needed for cellular respiration and removes the carbon dioxide produced by it.

Answer:

Breathing is the physical process of taking in oxygen and expelling carbon dioxide. It is related to cellular respiration as it supplies the oxygen required for cells to carry out cellular respiration (the metabolic process that breaks down glucose to produce energy) and removes the carbon - dioxide waste product of cellular respiration.