semester review (chapters1-3)

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Across
  1. 3. variable observed to in experiment
  2. 4. study of plants
  3. 6. transfer of pollen from anther to stigma
  4. 7. nervous system that contains brain and spinal cord
  5. 9. largest vessels that carry blood back to the heart
  6. 11. cut in more than one direction with equal halves
  7. 15. tiny air sacs found in person's lungs
  8. 18. process by which life continues
  9. 20. top layer of skin
  10. 22. largest part of the human brain
  11. 23. enclosed seeds
  12. 24. food making process of plants
Down
  1. 1. high concentration to low concentration through semipermeable membrane
  2. 2. system that releases hormones
  3. 5. system that controls body functions and activities
  4. 7. leaf more than one leaflet attached to petiole
  5. 8. system that breaks down food
  6. 10. plants that do all in one growing season
  7. 12. physical activity that strengthens the heart and lungs and burns fat
  8. 13. plants life
  9. 14. sensible but untested explanation
  10. 16. lower chambers of the heart
  11. 17. organ that produces bile
  12. 19. plant family that restores nitrogen into soil
  13. 21. growth of seed