Across
- 7. Cell organelle where DNA is located
- 8. Hair and nails are part of this organ system
- 9. Organelles that provide the energy for a cell
- 11. All the chemical reactions occurring in a cell
- 12. Feedback loop that reverses a controlled condition
Down
- 1. Discovered that all plants are made of cells
- 2. A tissue is made of many similar ______
- 3. Cell, tissue, organ, organ system, ______
- 4. Organ system that provides structure and support
- 5. Feedback loop that strengthens a controlled condition
- 6. Also known as the human immune system
- 10. The cell ______ surrounds all cell types