What substance does tree use for food?

They use a process called photosynthesis to make there own food. What the trees do is take in carbon dioxide, water and sunlight and convert into sugars in which they use for food and oxygen that the realises into the air and we use the oxygen they create to survive. The chemical equation to photosynthesis is 6co2( six molecules of carbon dioxide+ 6h2o( six water molecules) and sunlight= c6h12og ( sugar) and 6o2 ( six molecules of oxygen)