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an antigen preparation that stimulates the immune system to give protection against a particular disease or a group of diseases.
the second set of teeth formed in mammals. In humans there are thirty-two permanent teeth.
pollutant gases such as nitrogen monoxide and nitrogen dioxide. They are produced during ...
the loss of water vapour from the aerial parts of a plant through stomata or lenticels.
blood that has no antibodies (blood group AB) and can receive any type of blood.