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a collection of tissues joined in a structural unit to serve a common function.
the membrane that surrounds the nucleus. It is similar in structure and function to the cell...
an informal term for any living species which appears to be the same as a species otherwise only...
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...
chlorofluorocarbons (CFCs) are organic compounds that contain carbon, chlorine and fluorine.