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the windpipe or tube that carries air. It is kept open by C-shaped rings of cartilage.
biological classification group (taxon) for animals that is divided into classes. The plural of...
a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy,...
three pairs of exocrine glands which secrete saliva into the mouth.
found in the cell wall of xylem cells where the secondary cell wall is absent but the primary...