U1

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Across
  1. 3. the natural environment of an animal or plant
  2. 5. to feel pain or unhappiness
  3. 6. to think about in a serious and careful way
  4. 7. where something comes from
  5. 11. a topic or problem which causes concern and discussion
  6. 13. to hurt
  7. 16. at risk of no longer existing
  8. 17. to become liquid as a result of heating
  9. 18. someone's or something's health and happiness
  10. 19. in nature, not in a zoo, on a farm or as a pet
Down
  1. 1. the possibility of trouble, danger or disaster
  2. 2. not kind
  3. 4. to continue to live, in spite of danger and difficulty
  4. 7. a group of plants or animals which share similar features
  5. 8. on to need
  6. 9. a type of puzzle with a series of paths from entrance to exit
  7. 10. the situation in which someone lives or works
  8. 12. to keep safe from danger
  9. 14. violent or unfair treatment of someone
  10. 15. relating to the mind