Across
- 3. ______ gasses - said to cause global warming
- 6. amount of variation in an ecosystem
- 7. realistic model of growth
- 8. keeps the earth in balance
- 9. cycle that includes farm fertilization
Down
- 1. using organisms to clean up hazardous stuff
- 2. very rapid rate of growth
- 4. ______ factor - limits the growth of a population
- 5. cycle that includes evaporation and precipitation