As they breath out carbon dioxide the plants take in the carbon dioxide and make air with it. Animals also use air to do their day to day things like eat.
Photosynthesis results in increased biomass for a plant. I<span>n photosynthesis, carbon dioxide and water
yield glucose and oxygen. So, the carbon dioxide and water are taken in and are create a glucose. Glucose can be transformed into organic molecules, such as starch, which will increase biomass.</span>