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the thin moist surface across which gaseous exchange occurs.
single-celled organisms with all life functions performed within the cell.
(also called renal failure) the condition in which the kidneys are no longer able to function...
liquid which fills the spaces around the cells. It is derived from blood plasma but lacks the...
the inner most layer of the cortex of roots and some stems of plants.
small groups of cells found in the pancreas that secrete the hormones insulin and glucagon.