| A | B |
|---|
| Community | A group of various species that live in the same habitat and interact with each other |
| Ecosystem | A community of organisms and their abiotic environment. |
| Habitat | A place where an organism usually lives |
| Biodiversity | The variety of:organisms in an area, genetic variation in a population, species in a community, or communities in an ecosystem |
| Succession | The replacement of one type of community by another at a single location over a period of time |
| Climate | The average weather conditions in an area over a long period of time. |
| Biome | A large region characterized by a specific type of climate and certain types of plant and animal communities |
| Producer | A photosynthetic or chemosynthetic autotroph that serves as the basic food source in an ecosystem |
| Consumer | An organism that eats other organisms or organic matter; heterotroph |
| Decomposer | An organism that feeds by breaking down organic matter from dead organisms; heterotroph |
| Trophic Level | A step in the food chain or food (energy) pyramid |
| Energy Pyramid | A triangular diagram that shows ecosystem’s loss of energy through the food chain in an ecosysteman |
| Carbon Cycle | The movement of carbon through the environment |
| Respiration | The exchange of oxygen and carbon dioxide between living cells and their environment |
| Nitrogen Cycle | The cycling of nitrogen through organisms, soil, water, and the atmosphere |
| Phosphorus Cycle | The cycling of phosphorus through organisms and the environment |
| Water Cycle | The continuous movement of water through the atmosphere, land, and oceans. |
| Nitrification | The biological oxidation of ammonia with oxygen into nitrite followed by the oxidation of these nitrites (NO2) into nitrates (NO3). |
| Ammonification | Bacteria, or fungi in some cases, convert the organic nitrogen within the remains back into ammonium (NH4+), |
