Science crossword

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Across
  1. 3. The body trying to balance the amount of water in and out of your body.
  2. 5. Most organisms need it to survive.
  3. 7. The first word in the title.
  4. 9. A disturbance that transfers light.
  5. 10. Revolves around the earth.
  6. 11. The planet we all live on.
Down
  1. 1. The travel of planets around the sun.
  2. 2. Remains of a dead organism trapped in stone.
  3. 3. Tiny things that make up cells.
  4. 4. The largest star that all planets orbit.
  5. 6. Smallest unit of life.
  6. 8. Times of the year caused by the Earths axis.