| A | B |
|---|
| Ecology | The study of the interactions among organisms and their environment. |
| Abiotic | The nonliving parts of the environment. |
| Biotic | Living or once living organisms in the environment. |
| Organism | One individual from a population. |
| Population | All of the individuals of one species that live in the same area at the same time. |
| Community | The populations of different species that interact in some way. |
| Ecosystem | All of the communities in an area and the abiotic factors that affect them. |
| Biome | A large region with plants and animals well adapted to the soil and climate of the region. |
| Biosphere | The level of biological organization that is made up of all the ecosystems on Earth. |
| Population Density | The number of individuals in a population that occupy a definite area. |
| Limiting factor | Any biotic or abiotic factor that limits the number of individuals in a population. |
| Carrying Capacity | The largest number of individuals of a species that an environment can support and maintain for a long period of time. |
| Symbiosis | Any close interaction between two or more different species. |
| Mutualism | A symbiotic relationship that benefits both species. |
| Coimmensalism | A form of symbiosis that benifits one organism without affecting the other organism. |
| Parasitism | A symbiotic relationship between two species in which one species benefits and the other species is harmed. |
| Niche | The role, or job, of an organism in the ecosystem |
| Habitat | Thge place where an organism lives |
| Food Chain | A model, a simple way of showing how energy, in the form of food, passes from one organism to another. |
| Food Web | A series of overlapping food chains that exist in an ecosystem. |
| Water Cycle | The processes of evaporation, condensation, and precipitation |
