Bowlby - attachment concepts crossword

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Across
  1. 2. the evolutionary explanation for attachment
  2. 5. Bowlby believed infants have one special attachment
Down
  1. 1. Bowlby said long separation could cause this
  2. 3. the period when attachment must form
  3. 4. emotional reaction to being seperated
  4. 5. internal working what?