biology

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Across
  1. 2. species change in a population
  2. 4. no one is harmed
  3. 8. aquatic organisms
  4. 9. conditions over a time period
  5. 12. interaction between animals
  6. 13. any necesity of life
  7. 15. surviving and reproducing under bad conditions
  8. 19. feeds on producers
  9. 20. feed on skin and blood
  10. 21. tall trees
  11. 22. frozen subsoil
  12. 23. day to day conditions '
Down
  1. 1. combination of algae
  2. 3. relationship between species
  3. 5. zone dark
  4. 6. water covers soil
  5. 7. where a organism lives
  6. 10. succession less predictable changes
  7. 11. what a orgasim does and thinks
  8. 12. sicessions break down rock
  9. 14. short trees
  10. 16. sucessions farming
  11. 17. dense forest
  12. 18. zone light
  13. 20. species first to colonize barren areas