Ecology:,(

3. The study of how living things interact with each other and their environment
5. A group of ecosystems that share similar climates and typical organisms
7. An organism that obtains energy from the foods it consumes; also called a consumer
9. Competing species use the environment in different ways to minimize competition and help them co-exist.
10. factor Living (or formally living) parts of an ecosystem
11. factor Physical, or nonliving, factor that shapes an ecosystem
12. An organism that can harvest energy from the environment to make organic molecules, by processes such as photosynthesis or chemosynthesis.
14. Increased growth of plants and algae in bodies of water in response to an increase in nutrients (such as fertilizer run off).
16. Growth pattern in which the individuals in a population reproduce at a constant rate
18. A species that influences the survival of many other species in an ecosystem
19. A group of individuals that belong to the same species and live in the same area
20. Growth pattern in which a population's growth rate slows or stops following a period of exponential growth

1. Factor that limits a population more as the size of the population increases.
2. Accumulation of toxins at successive levels of the food chain.
4. Largest number of individuals of a population that an environment can stably support
6. A close, long-term relationship between two organisms
8. Limiting factor that affects all populations in similar ways, regardless of population size
13. The amount of biological diversity in an area. It includes the concepts of species diversity, habitat diversity and genetic diversity.
15. All the different populations of different species that live together in an area
17. The position an organism occupies within a food web.