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joints tha tallow limited movement e.g. between vertebrae.
emitting (or giving off) radiation energy, which is harmful to living organisms.
an atmospheric gas made of three oxygen molecules bonded together (O3).
organic compound that always contains the elements carbon, oxygen and hydrogen. The building...
the splitting of water molecules into oxygen atoms and energy-rich hydrogen atoms to be used in...
an infectious disease that can be spread or transmitted from one person to another.