Oxygen
We all know we need Oxygen because it helps us breathe.Oxygen is what assures we are alive. Animals need Oxygen to OBVI breathe and to filter out toxic chemicals that may enter the body. Oxygen is also another source of Energy. When Oxygen is present in Cellular Respiration, the mitochondria (powerhouse of the cell) will endure aerobic respiration that leads to the Krebs Cycle. Turning glucose and Oxygen into ATP.