Across
- 7. - Chemical messenger
- 8. - Group of organisms
- 9. - Control center of the cell
- 11. - Cell structure
- 12. - Genetic material
Down
- 1. - Plant energy process
- 2. - Biological community
- 3. - Darwin's theory
- 4. - Chemical structure
- 5. - Basic unit of life
- 6. - Large ecological region
- 10. - Catalyst in biology