Life cycle of a tree

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Across
  1. 3. used by
  2. 6. rootlets
  3. 8. cold season
  4. 9. body of
  5. 10. huge
  6. 11. green
Down
  1. 1. birth of a
  2. 2. begins life here
  3. 4. to survive
  4. 5. part of
  5. 7. before winter
  6. 12. needs