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| The process of changing free nitrogen so that the nitrogen can combine with other elements to form compounds that organisms can use. |
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| Any change in the environment that produces a condition that is harmful to living things. |
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| Chemicals that kill or control pests and weeds. |
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| Garbage found in households and industrial plants, such as large machinery. |
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| Waste water containing undissolved materials from your kitchen, bathroom, and laundry. |
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| Treated waste water that is released into lakes and rivers. |
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| Formed from dead animals and plants. |
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| Natural gas that contains hydrogen sulfide. |
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| Compound that dissolves in water to form a solution with a pH lower than 7. |
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| Compound that dissolves in water to form a solution with a pH higher than 7. |
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| The number of a solution that indicates its acidity. |
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| Compounds whose molecules contain carbon, except carbon dioxide,carbon monoxide, carbonates, and cyanides, which are inorganic compounds. |
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| Compounds whose molecules do not contain carbon. |
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Definition
| Nutrients needed in large amounts. Ex. Vitamin C |
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Definition
| Nutrients needed in small amounts. Ex. Selenium. |
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Definition
| Organic molecules made up of atoms of carbon, hydrogen, and oxygen. |
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| Compounds composed of many carbon, hydrogen, and oxygen atoms. Ex. Fats, oils, and waxes. |
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| Organic compound made up of units called amino acids; protein molecules contain atoms of nitrogen, hydrogen oxygen, and carbon. |
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Definition
| Building blocks of protein. |
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Definition
| Largest and most complicated molecules found in all the cells of living things; the two most important are DNA and RNA |
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| Process in which molecules move from an area of higher concentration. |
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Definition
| Type of diffusion in which water molecules move across a membrane from an area where there are more water molecules to an area where 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 higher concentration. |
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| Reaction of a substance with water. |
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| Surface on which an organism lives or moves. |
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