Related Clues:
- Rootless water life
- Biology 101 protozoan
- Microscopist's sighting (Var.)
- Pool microorganism
- Tiny pond organism
- Bit of aquarium growth
- Amorphous organism
- Lab-slide subject
- Simple animal
- Bio 101 subject (Var.)
- Bit of phytoplankton
- One-celled organism (Var.)
- Lichen component
- Tiny aquatic organism
- Oxygen releaser