paper chromatography is an analytical method used to separate colored chemicals or substances.
answer A system sounds like some serious thing you might find in an office somewhere, but systems are all around us, even if you don't know it. Your school has a system for how people move between classrooms, when you learn certain subjects, and when lunch happens. A computer is a system that takes inputs and turns them into outputs. A simple light bulb is a system because it takes electrical energy in and gives light energy out. Your body contains many systems, including the circulatory system that passes blood between your heart, lungs, and other parts of the body: