1. Carbon Dioxide (CO2): This is a byproduct of the breakdown of glucose during the Krebs cycle. CO2 is released as a gas and is exhaled by animals.

2. Water (H2O): Water is produced as a final product of the electron transport chain. The electrons that have been passed down the chain are finally accepted by oxygen, along with hydrogen ions, to form water.

In addition to these two main products, small amounts of other waste products can be produced, depending on the specific type of cellular respiration. For example, during anaerobic respiration, lactic acid can be produced as a waste product.

It's important to note that these waste products are not necessarily harmful, as they are often used by other organisms or recycled within the environment. For example, plants use CO2 for photosynthesis.