To access new levels, you must find clues and trap pieces within the hub area, which can be the reactants of photosynthesis. The clues can be the carbon dioxide. also, you have to collect trap pieces that reveal hints about how to progress through a level. trap pieces can be water in photosynthesis. So, clues(carbon dioxide or 6co2) + trap pieces (water or 6h20) yields scooby doo (character you play as and also solar energy) to advance to the next level. In the next level (cellular respiration) you will collect ingredients (glucose) + scooby snacks (oxygen). So, ingredients (glucose or c6h12o6) + scooby snacks (oxygen or 6o2) uses shaggy's food cart (chemical energy) to let scooby find more clues(create carbon dioxide or 6co2), find more trap pieces (water or 6h2o) and even scooby's lives(which can be ATP used for work). To conclude, here is the photosynthesis formula and the cellular respiration formula: 6co2 (6 clues)+6h20(6 trap pieces) yields solar energy(scooby doo) to produce c6h12o6(or to be able to find ingredients in the next level that is cellular respiration)+6o2(ability obtain scooby snacks) Cellular respiration formula: c6h12o6(ingredients)+6o2(trap pieces) uses transforms chemical energy(ingredients) to usable ATP(scooby's life)+co2(clues)+h2o(trap pieces).