First 4 sessions

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Across
  1. 2. culture
  2. 4. important/essential/vital
  3. 6. decrease
  4. 7. great grand parents
  5. 12. one of a kind
  6. 14. very old
  7. 15. collector
Down
  1. 1. different
  2. 3. means or ways
  3. 5. help
  4. 8. consuming
  5. 9. surviving or eating
  6. 10. societies
  7. 11. stable
  8. 13. many