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simple chemical substances needed by the body in relatively small amounts for normal growth and development. They usually occur in the form of ions.
the protective layer of fibrous connective tissue which surrounds each kidney.
waste water from sinks, washing machines, dishwashers, showers and baths, which can be used for...
middle body tissue layer that forms the muscular, circulatory and excretory systems.
cells that are formed during secondary growth by the vascular cambium ring just to the outside...