Living Systems

3. / A chemical in food that helps keep an organism alive and active
5. / The molecule in plant leaves that turns it green
8. / An animal that eats plants and animals
9. / An organism that breaks down dead plants and animals
12. / A process used by plants and algae to make sugar (food) out of light, carbon dioxide, and water
15. / An animal that eats plants
17. / A community of organisms interacting with each other and with the nonliving environment
18. / Organism that creates its own food
19. / An organism that gets its energy by consuming other organisms

1. / To act upon one another
2. / An animal that eats other animals
4. / Earth’s core, mantle, and crust
6. / The interacting water on, under, and above Earth’s surface
7. Web / The feeding relationships among all the organisms in an ecosystem
10. / The layer of gases surrounding Earth
11. / Earth's sphere that contains all living things
13. / A sugar found in food; the sugar broken down in cells to release energy
14. / A waste gas produced by plants during photosynthesis
16. Dioxide / Plants produce this gas during photosynthesis to make food
20. / The nutrient that cells use for energy