Across
- 3. allows the production of offspring
- 4. secrets chemical signals that allow body systems to act cooperatively as needed
- 6. fights infection
- 8. takes in food and processes it to obtain useful nutrients
- 9. allows the body to move on command
- 10. takes oxygen from the environment and converts it into a form that cells can use
Down
- 1. cleans dissolved waste products from the blood and excretes them
- 2. moves materials between body systems
- 5. covers the body and regulates its exchange with the outside world
- 7. allows perception, emotion, thought, and rapid response to the environment