| A | B |
|---|
| radula | tongue covered with curved teeth (how mollusks eat) |
| gastropods | slugs and snails group |
| bivalves | clams and other shellfish group |
| cephalapods | squid and octopus group |
| open circulatory system | heart pumps blood through sinuses |
| closed circulatory system | heart pumps blood in loop (squid and octopus) |
| foot | helps mollusks move (muscles) |
| visceral mass | gills, gut, and other organs in mollusks |
| mantle | tissue that covers the visceral mass |
| shell | protects the mollusks from predators and from drying out |
| annelid | means "segmented" worm |
