features and life characteristics

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Across
  1. 3. taking materials and making them useful
  2. 4. entering or leaving cells
  3. 6. constant internal environment
  4. 7. all the chemical reactions
  5. 9. releasing chemical energy
  6. 13. chemical substance in food
  7. 15. invokes two parents
  8. 16. the study of life
Down
  1. 1. controls and coordinates organism
  2. 2. simple substances to more complex
  3. 5. invokes one parent
  4. 8. increase in size
  5. 10. getting rid of undigested food
  6. 11. breaking down of food
  7. 12. taking in of food
  8. 14. removal of metabolic wastes