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outside the cells.
simple inorganic chemical substances (mineral salts) that are needed in relatively large amounts...
primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought...
is one-millionth of a metre or one-thousandth of a millimetre (0,001 mm). Its unit symbol in the...
rhythmical wave-like muscular contractions of a duct in order to cause movement of substances...