Across
- 2. offspring
- 3. with bones to move body
- 4. liquid waste
- 5. hair, nails, creates a waterproof barrier around body
- 7. hormones to keep various body systems in balance
- 9. breathing, exchange gas with lungs
- 10. protect and work with parts of body
- 11. the body against infections
Down
- 1. blood, nutrients, gases, and wastes
- 6. environment changes, sends signal to brain to feel
- 8. down food, removes wastes, absorbs nutrients