Ecology Crossword Puzzle

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Across
  1. 5. Nutrient needed for plant growth.
  2. 8. Water vapor released from plants.
  3. 12. Organism that makes its own food.
  4. 15. Too many nutrients in water causing algae growth.
  5. 16. Liquid all living things need to survive.
  6. 18. Rain, snow, sleet, or hail falling from clouds.
  7. 19. Large ecosystem with a certain climate and organisms.
  8. 20. Relationship where one organism benefits and the other is unaffected.
Down
  1. 1. Water vapor turning into liquid.
  2. 2. Process plants use to make food.
  3. 3. Organism that eats other organisms for energy.
  4. 4. Element needed to make proteins.
  5. 6. Living things that make their own food.
  6. 7. Water changing from liquid to gas.
  7. 9. Relationship where one organism benefits and the other is harmed.
  8. 10. Breakdown of dead organisms.
  9. 11. Layer of gasses that surround Earth.
  10. 13. Element found in all living things.
  11. 14. Relationship where both organisms benefit.
  12. 17. Tiny organsims that help recycle nutrients.