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epithelium with numerous layers of cells.
large spongy organs in which gaseous exchange takes place in vertebrates (with the exception of...
a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.
the loss of water from the land to the atmosphere by evaporation from land and water surfaces,...
the nerve cells that transmit nerve impulses towards the central nervous system from the...
the process whereby nutrients that have been absorbed from the digestive system are taken up by...