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the movement of respiratory gases across a respiratory surface.
drugs that are used to treat infections caused by bacteria. Many antibiotics are produced by...
a form of environmentally-friendly farming in which farmland and soil are cared for so that it...
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...
a thin hairlike outgrowth of an epidermal cell of a plant root that increases the surface area...