Science stuff

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Across
  1. 2. Beth Johnson studies people's...
  2. 5. It turns on the lights
  3. 8. A planet made of hydrogen
  4. 10. during the day it gives us sunlight
  5. 11. Humans are of...
  6. 12. We are made of them
Down
  1. 1. It keeps us hydrated
  2. 3. A planet that is a bit like Earth
  3. 4. It gets rid of colds
  4. 6. They give us oxygen
  5. 7. at night it gives off a bit of light
  6. 9. It runs through our body