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damage to the ozone layer caused by pollutants such as CFCs.
a layer of ozone gas which occurs naturally in the upper atmosphere, and protects life by...
the process whereby substances dissolved in the blood (such as H+ ions, nitrogenous waste and...
the internal supporting framework made of cartilage and/or bone. This type of skeleton occurs in...
the neurons that link motor and sensory neurons within the central nervous system.