Human Body Crossword

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Across
  1. 2. What part of the body can't feel pain
  2. 4. how many skin cells do you shed a minute
  3. 7. what organ can regenerate
  4. 8. at what stage of your life do you have 270 bones
  5. 9. how fast does information zoom along the nerves
Down
  1. 1. how many species of bacteria are in each human body
  2. 3. what part of your respiratory system filters the clean air from the dirty
  3. 5. how fast can a sneeze travel
  4. 6. how many times does the average heart beatcompared to a lifetime