Predict the effect of the loss of forests on cellular respiration in other organisms

During cellular respiration, oxygen is a necessary ingredient to make its process possible. Losing the forests would create a very huge impact on the cellular respiration in other organisms since the forest, which is composed of plants and trees, is the main source of oxygen. Without oxygen, cellular respiration will not happen in other organisms which would result in scarce food and eventually, most of the organisms will die.