| Select | | View | Download | | 36.2 Designing an investigation to study lichen distribution as an indication of air pollution (Investigative approach) | | |
| 36.2 Designing an investigation to study lichen distribution as an indication of air pollution (With procedure) | | |
| 36.4 Designing an investigation to study water pollution in a freshwater stream or a shore habitat (Investigative approach) | | |
| 36.4 Designing an investigation to study water pollution in a freshwater stream or a shore habitat (With procedure) | | |