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two or more forms of a particular chemical element, that have the same number of protons in the nucleus but have different numbers of neutrons in the nucleus. The different possible versions of each element are called isotopes.
the replacement of liver tissue by scar tissue due to damage to liver cells caused by excessive...
the structural and functional unit of the kidney, which filters the blood and produces urine....
the movement of molecules across a membrane against the concentration gradient, from an area of...