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is the supply of materials, in the form of food, required by organisms and cells to stay alive.
the outermost nucleated cytoplasmic layer of the Schwann cells that surrounds the axon of a...
specialised heart muscle tissue between the right atrium and right ventricle which conducts the...
the process whereby nutrients that have been absorbed from the digestive system are taken up by...
the windpipe or tube that carries air. It is kept open by C-shaped rings of cartilage.