Across
- 4. to protect our lungs
- 7. a group of same kind of cells
- 9. are place in our skeletal system where bones meet
- 10. to protect the organs inside our body
Down
- 1. is an animal with a backbone
- 2. to protect spinal cord
- 3. joints in our knees
- 5. is the smallest unit of life
- 6. is the example of organ
- 8. to protect our brain