Ecology

3. the study of the interactions between organisms and other living and nonliving components in their environment
5. a group of organisms that belong to the same species and live in a particular place at the same time
6. an organism that is able to make its own food
7. the part of earth where life exists; includes all living organisms on earth
8. a relationship in which both organisms benefit
10. one of the vast, nearly level, treeless plains of the arctic regions of Europe, Asia, and North America.
13. the process of one community replacing another community that has been partially or completely destroyed
15. a close, long-term relationship between two organisms
17. a relationship where one organism is harmed and the other organism benefits
19. living components of the ecosystem

1. the specific role of a species within its environment
2. trees that lose all of their leaves in the fall and regrow them each spring
4. the place where an organism usually lives
6. the development of a community in an area that has never supported life
9. tropical or temperate grasslands that have scattered deciduous trees and shrubs
11. an organism that lives by breaking down organic matter from dead organisms
12. the introduction of harmful substances or products into the environment
14. a relationship where one organism benefits while the other organism is not affected
16. a community of organisms and their abiotic environment
18. non-living components of the ecosystem; physical and chemical characteristics of the environment