Biology

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Across
  1. 1. The animal that is attacked.
  2. 4. A non living thing
  3. 6. One type of living thing
  4. 10. Various species that interact
  5. 11. To attack another species for food.
  6. 12. A living thing
  7. 13. First organisms that appear in an area
  8. 16. The replacement of one community by another in one location.
  9. 18. Greatest factor in keeping the size of population.
  10. 19. The concentration of a species in one area.
  11. 20. Entering a new area after leaving an old one.
Down
  1. 1. A group of organisms that are one species
  2. 2. An interaction that is beneficial to both species.
  3. 3. An interaction where one organism gets a benefit and hurts the other.
  4. 5. Leaving your own area to go to another one.
  5. 7. An interaction when one species gains a benefit and doesn't hurt the other.
  6. 8. A branch of biology that deals with the relationships of organisms.
  7. 9. An interaction between two species
  8. 14. A community of species that interact with their environment
  9. 15. Fighting over resources.
  10. 17. An organism that eats another animal