Across
- 4. To hold up something so that it doesn't fall down.
- 7. Parts inside the body that do different jobs.
- 9. The hard skins or shells on the outside of the bodies of some invertebrates.
- 11. An animal that has no backbone.
Down
- 1. Parts of the body that are joined to bones and allow us to move.
- 2. An animal with backbone.
- 3. The bones of the back.
- 5. Keep safe from harm.
- 6. When a muscle gets shorter and fatter.
- 8. The bones inside our body that are joined together.
- 10. The bone that joins the leg to the upper part of the body.
- 12. When a muscle gets longer and thinner.