Science this year

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Across
  1. 6. a unit of volume (for liquids)
  2. 9. the tiny parts that do a job within the cell
  3. 10. your largest organ
  4. 12. the one we live in is called the milky way
  5. 13. important organ for the digestive system
  6. 15. the planet we live on
Down
  1. 1. a living thing
  2. 2. keeps the planets in orbit around the sun
  3. 3. the smallest part of all living things
  4. 4. this system helps fight pathogens when you're sick
  5. 5. how much matter there is within a specific volume
  6. 7. a unit of mass
  7. 8. this system helps you breathe
  8. 11. similar to weight (how much matter something has)
  9. 14. important organ for the circulatory system