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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.
gaps (about 1 micrometre long) that occur between the myelin sheaths generated by consecutive...
a form of malnutrition caused by a severe shortage of protein in the diet.
potentially lethal disease in humans and grazing animals such as cows and sheep. The disease is...
the cavity used for transport purposes. It has one opening to the environment through which...