Growing Up!

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Across
  1. 4. These people sometimes need us to look after them.
  2. 8. Reproduction begins with what?
  3. 10. How many reproductive organs are there?
  4. 12. The air travels down two tubes called what?
  5. 14. There are different stages of ________.
  6. 15. There are three types of ______ in the circulatory system.
Down
  1. 1. The _______ is about the size of a small seed.
  2. 2. These store and produce sperm.
  3. 3. These carry blood back to the heart from the rest of the body.
  4. 5. The respiratory system is made up of ______ that help us breathe.
  5. 6. What sheet of muscle contracts when we breathe in?
  6. 7. The final stage of reproduction?
  7. 9. These carrry blood and nutrients from the heart to all parts of our body.
  8. 11. These store and produce eggs.
  9. 13. How many stages of life are there?