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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.
the condition caused by a severe shortage of both energy and nutrients in the diet over an...
a type of nuclear division during which somatic cells divide into new cells for growth or to...
the cylinder of parenchyma found from the centre of the stem to the inside of the vascular...