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a gut with two separate openings - a mouth and an anus.
an antigen preparation that stimulates the immune system to give protection against a particular...
is one-millionth of a metre or one-thousandth of a millimetre (0,001 mm). Its unit symbol in the...
a clear, colourless solution of hydrogen chloride (HCl) in water. It is a strong and highly...
a heart chamber that pumps blood from the heart to the body or lungs.