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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 replacement of liver tissue by scar tissue due to damage to liver cells caused by excessive...
the destruction of the enamel of a tooth owing to the action of bacteria that live in plaque....
the excessive growth of algae in eutrophic streams, rivers and dams.
cellular respiration that takes place in the presence of free oxygen.
small protrusions on the surface of mammalian teeth (premolars and molars), which help to grind...