ecology

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Across
  1. 4. the C of CO2
  2. 5. hunter
  3. 7. gets energy from sun
  4. 8. the O of CO2
  5. 9. total mass of life in an area
  6. 12. CO2
  7. 13. contest for a winning
  8. 15. the limit
  9. 18. living factors
  10. 19. only eats meat
  11. 20. variety of life somewhere
Down
  1. 1. sugar
  2. 2. H2O
  3. 3. producers,primary consumer, secondary consumer
  4. 6. consumes producer
  5. 10. only eats plants
  6. 11. nonliving factors
  7. 14. hunted
  8. 16. how plants make food
  9. 17. where life resides