Crossword of Nature

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Across
  1. 2. Second word for Atmosphere
  2. 4. where the oxygen is made?
  3. 6. who all we are?
  4. 8. It is in the solar system.
Down
  1. 1. Second thing everybody needs to live.
  2. 3. Where we live?
  3. 5. A creature lives on earth.
  4. 7. Everybody needs to live.