"Uni, Bi, and Tri," meaning "One, Two, and Three"

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Across
  1. 2. the only one of its kind
  2. 3. the large muscle on the front of your arm between your shoulder and inner elbow
  3. 5. a plant eating dinosaur with three horns
  4. 8. able to speak two languages
Down
  1. 1. a weapon, spear, or instrument with three prongs at one end
  2. 2. a vehicle having only one wheel
  3. 4. a mythical animal with a single horn on its head
  4. 6. a group of three people or things
  5. 7. to split something into two parts
  6. 9. to bring together to form a single group