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thin layer of living tissue between the xylem and the phloem, which is able to divide to make new cells.
primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought...
a serious and potentially fatal medical state caused by an allergic reaction, in which sufferers...
an atmospheric gas made of three oxygen molecules bonded together (O3).
an infection of the skin, caused by a parasitic fungus. It causes cracked, inflamed and itchy...
a social structure in which different classes are determined by heredity.