biology stuff

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Across
  1. 4. dirty
  2. 6. 30% of our world
  3. 10. not-alive things
  4. 11. top of the food chain
  5. 14. second worst
  6. 18. hunter
  7. 20. tiny hard stuffs found on beaches
Down
  1. 1. living things
  2. 2. colourful things that make up reefs
  3. 3. species move
  4. 5. makes food(bottom of food chain)
  5. 7. the thing organisms need to survive
  6. 8. 70% of our world
  7. 9. organisms eating each other
  8. 12. hard stuff
  9. 13. hunted
  10. 15. animals
  11. 16. cleanup crew
  12. 17. interaction between abiotic and biotic factors
  13. 19. organisms that eat