Related Clues:

• Single-celled organisms
• Pseudopod formers
• They may be seen on slides
• Units
• Wee shape-shifters
• One-celled creatures
• Biology class captives
• Tiny creatures
• Elementary substances
• One and the same
• Elementary parts
• They're seen under slides
• One-celled organisms
• Single-celled critters
• School lab subjects