

|
Breathing |
Respiration |
| 1. It is a physical process. | 1. It is a biochemical process. |
| 2. It simply involves exchange of gases - taking in of oxygen and giving out of carbon dioxide. | 2. It involves oxidation of food substrates to release energy. |
| 3. It takes place between organism and their environment. | 3. It takes place within a cell. |
| 4. No energy is released. | 4. Energy is released. |
