During photosynthesis light energy is converted to stored chemical energy by converting CO2 and water and then into sugar and oxygen.Sugar molecule contain hydrocarbon which is used to make amino acids. Matter and energy flow through different organization levels o living system. AS a result of chemical reaction, energy is transferred from one system of interacting molecules to another. In aerobic cellular respiration is a chemical process by which bond of molecules and oxygen and are broken to form new compounds which transport energy to molecule.
. IN anaerobic cellular respiration follows a less efficient chemical pathway to produce energy the cells.Energy released during respiration is also used to maintain body temperature.