ecology

5. - the disappearance of a species from the Earth.
8. - the process by which organisms with superior traits are more likely to survive and reproduce.
11. - a characteristic of an organism that helps it survive and reproduce in its environment.
12. - a group of individuals of the same species living in a particular area.
15. - an organism that breaks down dead or decaying organic matter.

1. - the variety of living organisms present in a given ecosystem.
2. - the seasonal movement of animals from one place to another.
3. - the study of interactions between living organisms and their environment.
4. - an organism that obtains its food by eating other organisms.
6. - an organism that makes its own food through photosynthesis or chemosynthesis.
7. - the natural environment in which an organism lives.
9. The position of an organism in a food chain or food web.
10. - the role an organism plays in its ecosystem.
13. - all the populations of different species living in a particular area.
14. - a community of living organisms in conjunction with the nonliving components of their environment.