Last seen in:
Related Clues:
- Bio 101 subject (Var.)
- Bit of phytoplankton
- One-celled organism (Var.)
- Lichen component
- Tiny aquatic organism
- Oxygen releaser
- Unwanted plant in a pool
- Agar source
- Amorphous critter
- Unwanted aquarium organism
- Some plankton
- Simple lab specimen (Var.)
- Organism frequently seen in 'The Far Side'
- Single-celled organism: var.
- Microscopic swimmer