| A | B |
|---|
| Abiotic | A nonliving factor or element (e.g., light, water, heat, rock, energy, mineral). |
| Acid deposition | Precipitation with a pH less than 5.6 that forms in the atmosphere when certain pollutants mix with water vapor. |
| Allele | Any of a set of possible forms of a gene. |
| Biochemical conversion | The changing of organic matter into other chemical forms. |
| Biological diversity | The variety and complexity of species present and interacting in an ecosystem and the relative abundance of each. |
| Biomass conversion | The changing of organic matter that has been produced by photosynthesis into useful liquid, gas or fuel. |
| Biomedical technology | The application of health care theories to develop methods, products and tools to maintain or improve homeostasis. |
| Biomes | A community of living organisms of a single major ecological region. |
| Biotechnology | The ways that humans apply biological concepts to produce products and provide services. |
| Biotic | An environmental factor related to or produced by living organisms. |
| Carbon chemistry | The science of the composition, structure, properties and reactions of carbon based matter, especially of atomic and molecular systems; sometimes referred to as organic chemistry. |
| Closing the loop | A link in the circular chain of recycling events that promotes the use of products made with recycled materials. |
| Commodities | Economic goods or products before they are processed and/or given a brand name, such as a product of agriculture. |
| Composting | The process of mixing decaying leaves, manure and other nutritive matter to improve and fertilize soil. |
| Construction technology | The ways that humans build structures on sites. |
