Let's think step by step! Some invertebrates may have which feature?
Options:
- (A) invertebrate
- (B) fat
- (C) gills
- (D) exception
- (E) three
- (F) mollusk
- (G) complex
- (H) shell
The thinking starts now:
Most mollusks have shells. Mollusks are invertebrates and are no exception. Some invertebrates have shells. The final answer: (H).