Amusing facts

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Across
  1. 2. How long do human babies stay in the womb?
  2. 5. This muscle contracts to enable breathing
  3. 7. The part of our vision that is missing due to a hole?
  4. 8. We still have traces of it at the bottom of our spine
Down
  1. 1. What breathing quirk arrived to us from fish and tadpoles?
  2. 3. The picture of the world arriving to our brains
  3. 4. This organ can fully regenerate itself if it is cut in a surgery
  4. 6. Where does light project when entering our eye?