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the hard 'roof' of the front of the mouth.
potentially lethal disease in humans and grazing animals such as cows and sheep. The disease is...
a hard granule of crystallised minerals which forms in the kidney.
animals with three cellular body wall layers: the ectoderm, mesoderm and endoderm.
the destruction of the enamel of a tooth owing to the action of bacteria that live in plaque....
animal wastes (particularly urine) that contain materials high in nitrogen.