Across
- 3. a living thing that gets energy from eating other living things
- 8. the process by which plants make food
- 9. an object in space made of gas and ice
- 11. eats only meat
- 16. when both organisms benefit
- 19. rocky surface in space that orbits the sun
Down
- 1. a living thing that makes its own food
- 2. eats only plants
- 4. the air humans breathe in and plants breathe out
- 5. responsible for holding Earth in orbit
- 6. a living thing that gets energy from breaking down waste and dead matter
- 7. a community of living organisms
- 10. the air humans breathe out and plants breathe in
- 12. term for an organism that invades
- 13. eats both plants and animals
- 14. when one organism benefits and the other doesn't care
- 15. when one organism benefits and one is harmed
- 17. how much matter is in an object
- 18. when several food chains are combined together