science systems thing

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Across
  1. 3. What can your stomach acid dissolve?
  2. 5. How fast can a thought travel through your neurons?
  3. 7. How many different systems are there?
  4. 8. How many different sections of a heart are there?
  5. 9. court When flattened out, what can our lungs completely cover?
  6. 10. What carries blood through you?
Down
  1. 1. How much bacteria is there in your mouth?
  2. 2. Which lung is smaller?
  3. 4. How many bones do you have?
  4. 6. What are bones stronger than steel, kilo to kilo?