Across
- 3. The largest planet in our Solar System, a gas giant
- 4. Refers to the living components of an ecosystem
- 7. Waste gas exhaled from the body
- 9. Organism that makes its own food, like a plant
- 11. The star at the center of our Solar System
- 12. Refers to the non-living components of an ecosystem
- 15. Process of breaking down food into smaller molecules
- 16. Main organs of the respiratory system
- 18. Tiny air sacs in the lungs where gas exchange happens
- 20. Organ that pumps blood throughout the body
- 21. Tiny blood components that help with clotting
- 22. Organism that breaks down dead organic matter
- 24. The curved path of a celestial object around a star or planet
- 25. Earth's natural satellite
- 28. Blood vessels that carry oxygenated blood away from the heart
- 29. The natural home or environment of an animal or plant
Down
- 1. The planet closest to the Sun
- 2. To breathe out
- 5. Tiny blood vessels where gas and nutrient exchange happens between blood and cells
- 6. A single pathway showing how energy moves from one organism to another
- 8. Blood vessels that carry blood back to the heart
- 10. The tube that connects the mouth to the stomach
- 11. Muscular organ where food begins to break down with acid
- 13. Large organ that produces bile and filters blood
- 14. Fluid that carries oxygen, nutrients, and waste in the body
- 17. A large celestial body that orbits a star
- 19. Long tube where most nutrient absorption occurs
- 23. Organism that obtains energy by feeding on other organisms
- 26. Gas we breathe in, vital for life
- 27. The force that pulls objects towards each other, holding planets in orbit