Marine biology

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Across
  1. 2. upper tide
  2. 6. waste or debris
  3. 8. feeds on organic matter
  4. 9. holds seaweed to bottom
  5. 11. the fight for food and habitat
  6. 13. resources that are limited
  7. 14. feed on plankton
  8. 15. main producers of food web
  9. 19. transition between ocean and land
  10. 23. nitrogen converted to ammonium
  11. 25. the hottest it can get
Down
  1. 1. very high tides
  2. 3. mollusk
  3. 4. the place an organism lives
  4. 5. lower tide
  5. 7. organ that helps bony fish float
  6. 10. active plates
  7. 12. composite organism
  8. 16. the group of species and the area
  9. 17. plants do this and release oxygen
  10. 18. one high one low tide
  11. 20. tides low tides
  12. 21. solid part of earth that moves like liquid
  13. 22. feeding structures
  14. 24. the range of tide heights