| A | B |
|---|
| system | A group of parts that work together as a unit. |
| stability | The condition that exists when the changes in a system over time cancel each other out. |
| ecosystem | groups of living things and the environment they live in |
| population | A group of the same species living in the same place at the same time. |
| community | All the populations that live in the same area. |
| habitat | An environment that meets the needs of an organism. |
| niche | The role or part played by an organism in its habitat. |
| producer | A living things, such as a plant, that makes its own food. |
| consumer | A living thing that eats other living things for energy. |
| decomposer | A living thing that feeds on the wastes of plants and animals or on their remains after they die. |
| energy pyramid | A diagram that shows how much food energy is passed from one organism to another along a food chain. |
| food web | A diagram that shows how food chains connect and overlap. |
| climate | The average temperature and rainfall of an area over many years. |
| diversity | variety |
| salinity | the amount of salt in water |
| intertidal zone | A narrow strip, along the shore, that is covered with water during high tide and exposed during low tide. |
| near-shore zone | Ocean zone that starts at the low-tide mark and goes out into the ocean. |
| open-ocean zone | The deep parts of the oceans, located far from shore. |
