Crossword

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Across
  1. 3. the study of people's efficiency in their working environment.
  2. 5. the surroundings or conditions in which a person, animal, or plant lives or operates
  3. 6. column of bones in our body
  4. 7. extreme tiredness resulting from mental or physical exertion or illness
Down
  1. 1. make (something) visible by uncovering it
  2. 2. make available for use
  3. 4. physical and mental well-being