Related Clues:

• Amorphous critter
• Microscopic animal
• Simple lab specimen (Var.)
• Organism frequently seen in 'The Far Side'
• The simple life?
• Bio lab subject
• Low life form
• Single-celled organism: var.
• Microscopic swimmer
• Life Science specimen
• Microscope slide creature (Var.)
• Protozoa
• Pseudopod-forming organism
• Pseudopod flexer
• Minute creature