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the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's surface.
the second biological classification group (taxon) that is divided into phyla (for animals) or...
an inorganic compound with the formula KOH, commonly called caustic potash. It can be used to...
a heart chamber that pumps blood from the heart to the body or lungs.
neurons that transmit nerve impulses away from the central nervous system to the effectors.
the part of the lung where the bronchi, bloodvessels and nerves enter and leave the lungs.