Across
- 3. relaxation of heart
- 7. Digestion of proteins
- 8. product of anaerobic respiration
- 11. biological catalysts
- 12. thick, elastic walls
- 13. respiratory pigment
- 14. Absorbs carbon dioxide
Down
- 1. transport of food
- 2. clotting of blood
- 4. ascent of sap
- 5. single circulation
- 6. Holozoic nutrition
- 9. Splits water molecules
- 10. excretory unit of the kidneys