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chlorofluorocarbons (CFCs) are organic compounds that contain carbon, chlorine and fluorine.
structure surrounding plan tcells i tgives cells rigidity and strength.
inflammation of the lining of the bronchi and bronchiole causing them to become clogged with...
cartilage with few collagen fibres and no elastin fibres. It reduces friction in joints,...
all the ecosystems on the Earth, all the species within these ecosystems and the genetic...
tissue that covers the surfaces of the body (the skin) and lines the ducts of the gut.