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