biology

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Across
  1. 4. in a defined area
  2. 7. reason for reaction
  3. 8. groups of ecosystems that have the same climate and similar dominant communities
  4. 10. groups of individuals of the same species that live in the same area
  5. 12. (many cells) like humans
  6. 13. (only one cell or single-celled) like bacteria
  7. 14. groups of all the organisms that live in a
Down
  1. 1. the basic unit of life
  2. 2. place
  3. 3. groups of different populations that live
  4. 4. any of the distinct types of material of which animals or plants are made
  5. 5. part of the Earth in which life exists including land, water, air and atmosphere
  6. 6. a living thing
  7. 9. a group of atoms bonded together
  8. 11. kidneys,heart,stomach