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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.
the passage through which the nerve and blood vessels leave the root of the tooth.
(also called transgenic organism) an organism whose genetic material has been changed using...
a relatively small, similar building block of larger molecules (polymers).
a fine thread-like structure. In plants: the stalk of the male sexual organ.