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the actions of the body's immune system that work to fight infections or disease.
the movement of respiratory gases across a respiratory surface.
atmospheric gases, especially carbon dioxide, methane, nitrous oxide, ozone and water vapour,...
a small finger-like blind-ending extension of the mammalian large intestine connected to the...
small solid particles of matter such as soot, ash, metal and dust.
the growth of cities due to the influx of people from rural areas.