Science crossword puzzle

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Across
  1. 4. works with the muscular system
  2. 6. the hardest working organ in your body
  3. 9. a website that helps you understand science
  4. 10. part of the respiratory system and digestive system
  5. 12. breaks down food chemically
  6. 15. a harmful device
  7. 17. in charge of your breathing
  8. 18. what you breathe in
  9. 19. blood with no oxygen travels through this passage
  10. 20. what you breathe out
Down
  1. 1. gives oxygen to your blood
  2. 2. what makes up a plant and other living things
  3. 3. works with the skeletal system
  4. 5. a tube where food comes down
  5. 7. inside cells
  6. 8. blood with oxygen travels through this passage
  7. 11. helps digest food
  8. 13. Google slides that ask questions about the topic we are working on
  9. 14. a body system that includes the brain and spinal cord
  10. 16. what makes up the skeletal system