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cells that are formed during secondary growth by the vascular cambium ring just to the inside of the primary phloem.
allergic reaction to certain allergens such as pollen. It causes sneezing, a runny nose and...
chlorofluorocarbons (CFCs) are organic compounds that contain carbon, chlorine and fluorine.
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...
large blind-ending sac forming the first part of the mammalian large intestine, to which the...
primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought...