Ecology

5. Interactions between species that strive for the same limited resources
7. The natural home or environment of a plant, animal, or other organism
9. An organism that can create it's own food
12. The movement of energy from one form to another
13. A colorless, odorless gas
14. The process by which plants, algae, and some bacteria use sunlight to make food
15. An organism that cannot produce its own food
16. A model that shows the flow of energy from one trophic, or feeding, level to the next is an ecosystem
17. The mass of living biological organisms in a given area or ecosystem at a given time
18. Animals that are killed and eaten by other animals
19. The movement of substances from regions of lower concentration to regions of higher concentration by the use of energy

1. Total amount of greenhouse gases emitted into the atmosphere by an individual
2. A community of living organisms interacting with their non-living physical environment within a specific geographic area
3. Organism that hunts and kills other organisms for food
4. The variety of all life forms on Earth
6. An organism that causes ecological or economic harming a new environment where it is not native
8. An organism that breaks down or eats Decaying material for its energy source
10. The range of different genetic variations within a species population
11. The long term rise in Earth's average surface tempature
20. Long term shifts in temperatures and weather patterns