??? ??? ??? Photosynthesis process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and glucose ??? ??? ??? Autotroph an organism that makes its own food ??? ??? ??? Heterotroph an organism that cannot make its own food ??? ??? ??? Cellular respiration Process that uses glucose to make energy, ATP ??? ??? ??? Pigment Light-absorbing molecule