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simple inorganic chemical substances (mineral salts) that are needed in relatively large amounts for normal growth and development of a living organism.
when the body makes its own antibodies when deliberately exposed to a dead or weakened pathogen...
the muscular tube of the mammalian digestive tract that links the mouth to the stomach.
organic compound that always contains the elements carbon, oxygen and hydrogen. The building...
middle body tissue layer that forms the muscular, circulatory and excretory systems.
the clear colourless fluid that occurs in the spaces, such as the ventricles and central canal,...