Final answer:
Cellular respiration occurs in the cells of all living things and is the process by which cells break down glucose to form ATP. It happens in the mitochondria and is different from photosynthesis.
Step-by-step explanation:
Cellular respiration occurs in the cells of all living things, both autotrophs and heterotrophs. It is the process by which cells break down glucose to form ATP, the energy currency of cells. The reactions of cellular respiration include glycolysis, transformation of pyruvate, the Krebs cycle, and oxidative phosphorylation. Unlike photosynthesis, which occurs in the chloroplasts of plants, cellular respiration occurs in the mitochondria of cells