Uni,Tri ,and Quad Word Puzzle

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Across
  1. 4. every two weeks
  2. 6. a stool used to hold a camera
  3. 8. One of a kind
  4. 9. saying a word at the same time
  5. 12. galaxy
  6. 13. a bicycle
  7. 14. of three related movies
Down
  1. 1. four children
  2. 2. two languages
  3. 3. a two-footed creature
  4. 5. glasses with two different sections
  5. 6. tree people
  6. 7. becoming one group
  7. 10. plane with two pairs of wings
  8. 11. cutting something in two equal parts