Uni, Bi, Tri

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Across
  1. 4. a race with three sports
  2. 5. A mystical horse with one horn
  3. 6. A stand with three legs
  4. 8. Happens every two weeks
  5. 10. a shape with three sides
  6. 11. When voices or sounds happen as one
  7. 14. - Clothing that makes everyone look the same
  8. 15. Three related books or movies
Down
  1. 1. Glasses with two lens strengths
  2. 2. Everything that exists as one whole
  3. 3. A cycle with one wheel
  4. 7. A vehicle with two wheels you pedal.
  5. 9. - A person who speaks two languages
  6. 12. Two part muscle in your upper arm
  7. 13. A bike with three wheels