How Do Cats Land on Their Feet

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Across
  1. 3. Move in a circle around an axis or center.
  2. 5. Of, relating to, or affecting cats or other members of the cat family.
  3. 7. Interaction, reciprocal relationship, or influence.
  4. 9. Relating to a vestibule, particularly that of the inner ear, or more generally to the sense of balance.
  5. 13. The quantity of motion of a moving body, measured as a product of its mass and velocity.
  6. 14. The origin or mode of formation of something.
  7. 15. Arrange in a straight line.
  8. 17. The quality of being able to flow easily.
  9. 18. Closely and neatly packed together; dense.
Down
  1. 1. Relating to an angle or angles.
  2. 2. Plural of axis - a straight central part in a structure to which other parts are connected.
  3. 4. The ability to move quickly and easily.
  4. 6. Of or relating to space.
  5. 7. Not allowing fluid to pass through.
  6. 8. Technical term for collarbone.
  7. 10. Of, relating to, or forming part of the skeleton.
  8. 11. In a very quick manner.
  9. 12. A property of matter by which it continues in its existing state of rest or uniform motion in a straight line unless changed by an external force.
  10. 16. Very complicated or detailed.