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a cell that contains two sets of chromosomes.
animals with two cellular body wall layers: the ectoderm and endoderm.
(also called the carina) in birds is an extension of the sternum (breastbone) which runs along...
chlorofluorocarbons (CFCs) are organic compounds that contain carbon, chlorine and fluorine.
a group or category in the biological classification system (the plural of taxon is taxa).