??? ??? ??? photosynthesis the process by which plants and some other organisms convert light energy to chemical energy. ??? ??? ??? oxygen byproduct of photosynthesis ??? ??? ??? plants, algae, protists, bacteria 4 photoautotrophs that use photosynthesis ??? ??? ??? shut down chlorophyll, turn on carotenoids why leaves change color in the fall ??? ??? ??? carotenoids do not produce enough ATP why