carbohydrates: Energy-packed compounds consisting of carbon, hydrogen, and oxygen that provide quick fuel for organisms.

cellulose: A form of carbohydrate that has a structural role in living organisms (animals and plants).

centrifuge: A machine that is used to separate blood cells and platelets from plasma.

chloroplasts: Plant cells that use energy from sunlight to create food.

cytoplasm: The fluid contained within animal cells. Also called plasma.