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