Energy is released by the food organisms consume through the process of cellular respiration during this process oxygen is consumed and is produced and released into the atmosphere.

Carbon dioxide

Explanation:

Cellular respiration is given by the equation; glucose + oxygen  carbon dioxide + water + energy

C6H12O6 + 6O2 --> 6CO2 + 6H2O + 36 or 38 ATP

It has three phases; glycolysis that occurs in the cytoplasm of the cell then Krebs cycle that occurs in the matrix mitochondria then electron transport chain that occurs in the intermembrane space of the mitochondria.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.