Morphology crossword

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Across
  1. 2. Half of a circle.
  2. 4. Alone/by oneself.
  3. 5. Relating to a city or town.
  4. 6. To make or become one.
  5. 9. Lens/glasses for one eye.
  6. 10. Triangle with same length sides.
  7. 11. Two singers/musicians who play/sing together.
  8. 14. Junction of 3 roads.
  9. 15. Something sung by a singular actor.
  10. 17. Occurring every 2 years.
  11. 18. Easy to tell or locate.
  12. 19. To ward off/defend.
  13. 20. An animal able to live on both land and water.
Down
  1. 1. The middle number.
  2. 3. Movement of blood around the body.
  3. 7. Vehicle with two wheels.
  4. 8. Half a sphere.
  5. 12. Affecting or occurring on only one side.
  6. 13. The study of city-life.
  7. 16. A mythical creature: A horse with a narwhal horn.