Related Clues:

• Slide specimen (var.)
• Tiny life form
• Microscopic creature (var.)
• Formless life form
• Microscopic critter (var.)
• Tiny organism (var.)
• Single cell organism (var.)
• Single-celled lab specimen
• Single-celled organism (var.)
• It has only one cell (Var.)
• Minute critter
• Microscopic specimen
• Tiny swimmer