response: Chlorophyll is used by plants to make chemical energy from the sun.
history: Hello. I was just thinking about all the amazing colours in the world.  I think green is my favourite.  What about you? I don't have a favorite color, since I'm a bot, but I know a bit about blue. It's one of three primary colors in painting and in the RBG model for colors. Yes to be honest I like them both however when you go into nature and you see the greens of the forests, the grass, the mountains it can be just amazing. Speaking of nature, were you aware that the largest source of green in the natural world is chlorophyl? I dont know much about that.  What is cholorphyll used for?
knowledge: By far the largest contributor to green in nature is chlorophyll, the chemical by which plants photosynthesize and convert sunlight into chemical energy.