Related Clues:

• Little fish
• Simple lab specimen
• Single-celled organism (Var.)
• Doubler in division
• It divides to multiply
• Bio 101 subject
• Single-celled blob
• Biology 101 subject (Var.)
• Tiny organism (Var.)
• One-celled protozoan (Var.)
• Slide subject
• Tiny fish
• Unicellular critter
• Minuscule creature
• Microscopist's sighting (Var.)