Across
- 2. group of various species that live in the same habitat
- 3. place where an organism lives
- 6. resource that is not replenished naturally
- 7. species that is nonnative to an area
- 9. heat-trapping gas molecule
- 12. of organisms in a given area
- 13. relationship between two species in which they both benefit
- 16. only nonrenewable energy source that is not a fossil fuel
- 17. animals that are found on a farm or ranch
- 18. structure built across a river to control its flow
Down
- 1. illegal hunting or killing of a protected species
- 4. malnutrition and starvation
- 5. of the atmosphere where UV radiation is absorbed
- 8. facilities in an area, such as roads and hospitals
- 10. reestablishment of trees in an area
- 11. species that colonizes an uninhabited area
- 14. area of land used for permanent waste disposal
- 15. most common element found in the atmosphere