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the windpipe or tube that carries air. It is kept open by C-shaped rings of cartilage.
produced, growing, living, or occurring naturally in a particular region or environment.
a naturally occurring sequence of organisms from the various trophic levels that feed on each...
hollow tubular vascular tissue cells, strengthened with lignin that conducts water and mineral...
a rubbery, protein-carbohydrate complex that forms the matrix of cartilage.