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the windpipe or tube that carries air. It is kept open by C-shaped rings of cartilage.
elongated cells in the xylem of vascular plants that transport water and mineral salts.
the process of moving organic material via the phloem sap.
the loss of water vapour from the aerial parts of a plant through stomata or lenticels.
the main force responsible for the upwards movement of water in the xylem.
valve between the right atrium and the right ventricle.
animals with three cellular body wall layers: the ectoderm, mesoderm and endoderm.