Related Clues:
- One-celled organisms
- Single-celled critters
- School lab subjects
- Low life
- Single-celled swimmers
- Some protozoa
- Studies under a microscope
- Shape shifters?
- Microscopic shape-shifters
- Protean ones
- They reproduce via mitosis
- They're often under the microscope
- Unicellular swimmers
- Teensy critters
- Shapeless blobs