1. Phylum Mollusca; Class Gastropoda

2. Its mantle has been converted to an air-breathing lung

3. The pneumostome

4. It is the opening to the respiratory system (lung)

1. To what Phylum and Class does this terrestrial slug belong?

2. What modification of this organism permits it to breathe air?

3. What is the name of the small hole pointed to by the red arrow?

4. What is the function of this hole?

 Answers