🏆 B3a Gas exchange EXTENSION

1. Gas exchange in animals BIOFACTSHEET

2. Insect tracheal system BIOFACTSHEET

3. Gas exchange in plants BIOFACTSHEET

4. Adaptations to water availability BIOFACTSHEET

5. Xerophytes and hydrophytes BIOFACTSHEET

6. Biology of risk factors - smoking BIOFACTSHEET

7. COPD - Chronic obstructive pulmonary disease BIOFACTSHEET