| A | B |
|---|
| Bivalvia | class of two-shelled mollusks |
| Gastropoda | class of stomach-footed mollusks |
| Mollusca | phylum of soft-bodied animals |
| Cephalopoda | class of head-footed mollusks |
| Oligochaeta | class of earthworms |
| Annelida | phylum of segmented worms |
| Hirudinea | class of leeches |
| Polychaeta | class of marine worms |
| Animalia | Kingdom |
| Stomach | digests food using enzymes |
