Related Clues:

• Low life
• Single-celled swimmers
• Some protozoa
• Studies under a microscope
• They're seen on slides
• Tiny pond denizens
• Pond critters (Var.)
• Shape shifters?
• One-cell creatures
• Microscopic shape-shifters
• Protean ones
• They reproduce via mitosis
• They're often under the microscope
• Unicellular swimmers
• Teensy critters