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the process whereby nutrients that have been absorbed from the digestive system are taken up by the cells and become part of the cells cytoplasm.
organisms that feed on dead organic matter and thereby release nutrients back into the soil.
the windpipe or tube that carries air. It is kept open by C-shaped rings of cartilage.
the passage through which the nerve and blood vessels leave the root of the tooth.
organic compound that always contains the elements carbon, oxygen and hydrogen. The building...
a system of veins which carries blood from the digestive tract to the liver.