Across
- 4. spread pollen around so the plant can reproduce
- 5. has no back bone
- 7. filters the blood and helps with digestion
- 9. an hard protective layer on the outside of arthropods
- 12. caused by the Earth's tilt
- 13. where photosynthesis happens in a plant
Down
- 1. system one star and all the things that orbit that star
- 2. a waste product humans breath out but plants breathe in
- 3. the earth makes one of these every 24 hours
- 5. because of this you need to wear a seat belt
- 6. has a back bone
- 8. helps with digestion and regulates body sugar
- 10. the main part of the plant involved in reproduction
- 11. made of solar systems