Across
- 3. organism that does photosynthesis
- 8. cause of competition
- 9. limits population growth
- 13. scale for measuring earthquakes
- 14. herbivore
- 16. swapping soybeans and corn yearly
- 17. higher level consumer
- 19. unit of energy
- 20. endangered species that may not recover
Down
- 1. comparison of births and deaths in population
- 2. carbon dioxide
- 4. why people care about global warming
- 5. crops with altered DNA
- 6. fuel for nuclear power
- 7. energy made from sunlight
- 10. product of photosynthesis
- 11. amount of calories making it to next level
- 12. members of a population
- 15. where excess food is stored in plants
- 18. species that is nonnative and destructive
- 19. energy that does not pollute