Across
- 4. Struggle between organisms for resources
- 6. Top layer of trees in a forest
- 8. Different populations living together
- 9. Community of living and nonliving things
- 11. Group of the same species in one area
- 12. Organism that breaks down dead matter
- 14. Layer of plants beneath the canopy
- 15. Variety of living things in an area
- 16. Organism that eats other organisms
- 18. Usual weather conditions of an area
- 19. Amount of rain an area receives
- 20. Substances needed for growth
Down
- 1. Process plants use to make food
- 2. Natural change in an ecosystem over time
- 3. Trait that helps survival
- 5. Ground where plants grow
- 7. Natural home of an organism
- 10. Animal that hunts other animals
- 11. Animal hunted by a predator
- 13. Organism that makes its own food
- 17. Main source of energy for plants