In-service puzzle

2. Organisms that require organic matter as a source of food.
5. Splitting of a uranium atom.
7. Energy that uses heat from the earth.
8. A relationship in which both species benefit.
10. The process of destroying a forest, often for the purposes of fuel, building materials, or to clear land for farming.
12. Another name for radioactive hydrogen.
14. The ethic holds the view that all forms of life have an inherent right to exist.
15. Another name for gasoline.
17. The space in which an organism lives; it is defined by the biological requirements of each particular organism.
18. Name of molecule made up of 3 oxygen atoms.
19. Automobile that uses both gasoline and batteries.

1. A region in which the organisms and the physical environment form an interacting unit.
3. A population of all the organisms potentially capable of reproducing naturally among themselves and having offspring that also reproduce.
4. Distinct pieces of DNA that determine the characteristics an individual displays.
5. Thought to be a major cause of past extinctions.
6. An assemblage of all interacting species of organisms in an area.
9. An approach finds a balance between unrestrained development and preservationism.
11. The movement from an area.
13. The study of populations and their characteristics, how those characteristics affect growth, and the consequences of that growth.
16. The most abundant fossil fuel.