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cells that are formed during secondary growth by the vascular cambium ring just to the inside of the primary phloem.
chlorofluorocarbons (CFCs) are organic compounds that contain carbon, chlorine and fluorine.
a social structure in which different classes are determined by heredity.
a group or category in the biological classification system (the plural of taxon is taxa).
specialised heart muscle tissue between the right atrium and right ventricle which conducts the...