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| process of changing free nitrogen so that the nitrogen atoms can combine with other elements to form compounds that organisms can use. |
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| free nitrogen is in the air and you can get it form bacteria. |
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| any change in the enviroment that produces a condition that is harmful to living things |
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| are chemicals used to kill pest. |
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| herbacides kill or contol weeds |
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| solid waste can be recycled but the ones that can't are burned in special plants that put pollution in the air. |
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| wastewater containing dissolved and un dissolved materials from your kitchen, bathroom and laundry. |
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| wastewater released from a factory or sawage treatment plant. |
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| coal, oil and natural gas is called fossil fuels because they are formed from dead plants and animals. |
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| natural gas that contains hydrogen sulfide. |
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| compounds that dissolves in water to from a solution with pH lower then 7. |
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| compounds that dissolves in water to form a solution with pH higher then 7 |
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| measure of the percent of hydrogen ions in a solution. |
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| reaction between an acid and a base that produces water and a soild compound called a salt |
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| compounds whose molecules contain carbon (e.g fossil fuels) |
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| compounds whose molecules do not contain carbon, also included as inorganic compounds are carbon dioxide, carbon monoxide, carbonates, and cyanides. |
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| nutrients that organisms need in relatively large amounts. |
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| elements such as selenium are also essential for plant and animal growth and development. however they are needed in only minor or trace amounts, so they are called micronutrients |
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| organic molecules made up of atoms of carbon, hydrogen, and oxygen( e.g., pasta, rice potatoes, fruits, bread) |
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| organic molecules made up of atoms of carbon, hydrogen and oxygen. |
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| organic compounds made up of units called amino acids. |
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| building blocks of proteins |
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| largest and most complicated molecules found in all the cells of living thing. |
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| process in which molecules move from an higher concentration to one of lower concentrations. |
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| type of diffusion in which water molecules move across a membrane from an area where there are more water molecules to an area whereergy to move there are fewer water molecules. |
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| process in which plant cells use energy to move nutrient molecules from areas of lower concentration to areas of concentration |
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| reaction of a substance with water; hydro" means water and " lysis" means break down. |
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| surface on which an organism lives or moves. |
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