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| Any of several nonliving, physical conditions that affect the survival of an organism in its environment |
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| the process by which water and dissolved solids, liquids, and gases are taken in by the cell through the cell membrane |
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| In human beings, any organ that has a digestive function but is not part of the food tube (ex. liver, gallbladder, pancreas |
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| A chemical that releases hydrogen ion in solution with water |
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| a phenomenon in which there is thought to be an interaction between atmospheric moisture and the oxides of sulfur and nitrogen that results in rainfall with low pH values |
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| the immunity that develops when the body's immune system is stimulated by a disease organism or vaccination |
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| the specific area of an enzyme molecule that links to the substrate molecule and catalyzes its metabolism |
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| a process by which materials are absorbed or released by cells against the concentration gradient (from low to high concentration) with the expenditure of cell energy |
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