1. ATP (Adenosine Triphosphate): This is the primary energy currency of cells. The process of cellular respiration breaks down glucose and uses the released energy to produce ATP.

2. Water (H2O): Water is produced as a byproduct of the electron transport chain, the final stage of aerobic respiration.

3. Carbon Dioxide (CO2): Carbon dioxide is released during the Krebs cycle, another stage of aerobic respiration.

4. Heat: Cellular respiration is not perfectly efficient, and some of the energy released from glucose is lost as heat.

In summary:

* Energy (ATP)

* Water (H2O)

* Carbon Dioxide (CO2)

* Heat