Match each of the following structures with its correct definition A. The exchange of gases with the respiratory medium
B. Respiratory structures that represent invaginations of the body
C. Extensive system of air tubes in insects
D. Air hole on insect exoskeleton that controls air flow.
E. Small air pocket of mammalian lung
F. The air tubes of the unique respiratory system of insects
1. Breathing

2. Lungs

3. Alveoli

4. Tracheae

5. Tracheal system

6. Spiracles