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| A nonliving factor or element |
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| Precipitation with a pH less than 5.6 that forms in the atmosphere when certain pollutants mix with water vapor |
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| Any of a set of possible form of a gene |
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| The changing of organic matter into other chemical forms |
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| The variety and complexity of species present and interacting in an ecosystem and the relative abundance of each |
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| The changing of organic matter that has been produced by photosynthesis into useful liquid, gas or fuel |
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| The application of health care theories to develop methods, products and tools to maintain or improve homeostasis |
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| A community of living organisms of a single major ecological region |
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| The ways that humans apply biological concepts to produce products and provide services |
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| An environmental factor related to or produced by living organisms |
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| The science of composition, structure, properties and reactions of carbon based matter, especially of atomic and molecular systems; sometimes referred to as organic chemistry |
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| A link in the circular chain of recycling events that promotes the use of products made with recycled materials |
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| Economic goods or products before they are processed an/or given a brand name, such as products of agriculture |
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