B21

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Across
  1. 5. Uptake of substances
  2. 6. Speed of growth
  3. 8. Breakdown of food into nutrients
  4. 9. Circulation of water on Earth
  5. 12. Obtaining and using food
  6. 14. Process converting light energy into chemical energy
  7. 15. Movement of nitrogen through nature
Down
  1. 1. Movement of materials
  2. 2. Speed of cellular respiration
  3. 3. Removal of waste products
  4. 4. Process releasing cellular energy
  5. 7. Movement of carbon through ecosystems
  6. 10. Movement of substances through an organism
  7. 11. State of stability
  8. 13. Repeating sequence of events