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a thick layer inside the primary cell wall. It consists mainly of cellulose, hemicellulose and lignin, and makes the cell walls rigid and waterproof.
an artificial device that helps to stimulate and regulate the heart muscle.
a viral disease caused by Lyssavirus spp that causes acute inflammation of the brain in...
animals with two cellular body wall layers: the ectoderm and endoderm.
an infectious disease that can be spread or transmitted from one person to another.