Across
- 7. Necessary
- 8. Groups of cells that have the same job
- 9. The system that rids the body of liquid waste
- 10. The system that breaks down food
Down
- 1. What Anton van Leeuwenhoek used to view tiny bacteria
- 2. The liquid that is vitally important to life on Earth
- 3. Groups of tissues
- 4. Another word for job
- 5. Smallest unit of human life
- 6. Nourishing substances needed for growth