Unit 2 crossword

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Across
  1. 1. first step of photosynthesis
  2. 3. sphere of all earth all gases surrounding earth
  3. 8. organelle site of photosynthesis
  4. 11. second step of photosynthesis
  5. 14. third step of aerobic respiration
  6. 17. substances created during a chemical reaction made from reactants
  7. 19. sphere of earth all living things on earth
  8. 20. a situation when oxygen is not present
Down
  1. 2. pigment in chloroplasts used to trap light energy
  2. 4. first step of aerobic respiration
  3. 5. substances at the beginning of a chemical reaction
  4. 6. second step of anaerobic respiration
  5. 7. process of using light energy to make glucose
  6. 9. nutrient used in phosphate on nucleic acids
  7. 10. second step of aerobic respiration
  8. 12. type of organism that makes its own food
  9. 13. adenosine triphosphate
  10. 15. adenosine diphosphate
  11. 16. of all earth all of the water on earth
  12. 18. describes a situation when oxygen is present