Biology Crossword Puzzle

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Across
  1. 3. This plant system moves water from the roots up to the leaves
  2. 5. This nitrogen base binds with Thymine in DNA
  3. 7. This body system sends electrical messages to the body
  4. 9. This cell type has a nucleus
  5. 12. This is the shape of DNA
  6. 14. The building blocks of life
  7. 15. This nitrogen base binds with Adenine in DNA
  8. 16. This body system eliminates waste from the body
  9. 17. This cell type does not have a nucleus
  10. 20. This body system covers the body and includes skin
Down
  1. 1. This body system includes the heart and blood vessels
  2. 2. This body system is responsible for fighting off foreign invaders
  3. 4. This body system is responsible for breathing
  4. 6. This nitrogen base binds with Cytosine in DNA
  5. 8. This Nitrogen base binds with Guanine in DNA
  6. 10. The smallest unit of life
  7. 11. This plant system moves sugar from the leaves down to the roots
  8. 13. This body system is responsible for releasing hormones to the body
  9. 18. This body system is responsible for providing support and structure to the body
  10. 19. This body system breaks down food into smaller molecules
  11. 21. This nitrogen base is only found on RNA