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an organism that helps to spread a disease, but is not infected with the disease.
the natural resistances with which a person is born. It occurs because of a body's genetic make-...
diet which contains all the nutrients needed by the body in the correct quantities and...
small fluid-filled sacs that store, transport, or digest cellular products and waste.
the outer most layer of tightly packed modified parenchyma cells in plants.
is one-millionth of a metre or one-thousandth of a millimetre (0,001 mm). Its unit symbol in the...