UNIT 1: ENVIRONMENT

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Across
  1. 4. to move into or through sth
  2. 7. returning an environment to its natiural state
  3. 8. the fact that an animal hunting other animals
  4. 10. very steep, or dropping very fast
  5. 11. consequence, bad effect on something
Down
  1. 1. to try to make a bad situation better
  2. 2. new, in perfect condition
  3. 3. a permanent change in an organism
  4. 5. lasting for only a short time; temporary
  5. 6. to become four times as big
  6. 9. the process of becoming more active or popular again