ooh! i know photosynthesis and i have been doing it in school. so the glucose and oxygen combine to make the photosynthesis and it is so important to not forget about carbon dioxide and all the features for that because a plant needs carbon dioxide while we need oxygen and plants give out oxygen so that humans can have it and we breathe out carbon dioxide so that plants can have it. we pretty much just each other out. i plants weren't there than humans wouldn't be there. hope this !