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Across
  1. 3. The movement of particles from high to low concentration.
  2. 4. The red pigment in blood that carries oxygen.
  3. 5. dioxide, The gas plants take in during photosynthesis.
  4. 10. The process of releasing energy from food.
  5. 11. The largest organ in the human body.
  6. 13. The control centre of a cell.
  7. 15. Tiny blood vessels where exchange of gases occurs.
  8. 16. The green pigment that absorbs light for photosynthesis.
Down
  1. 1. The process plants use to make food.
  2. 2. The organ responsible for filtering blood.
  3. 6. Blood vessels that carry blood away from the heart.
  4. 7. The basic unit of life.
  5. 8. The sugar made during photosynthesis.
  6. 9. The organ that pumps blood around the body.
  7. 12. The liquid part of blood.
  8. 14. Tiny air sacs in the lungs.