Historical clue formulations

• Lives in a cell? — 2015-02-25
• Single-celled creatures — 2011-11-23
• Real low life? — 2009-05-22
• Unicellular life — 2000-12-27
• Lab slide objects, often — 1998-10-25
• Protozoans — 1996-04-18
• Marine biology subject — 1995-06-11
• Tiny organisms — 1995-05-03
• Unicellular life — 1995-04-21
• Pseudopodal organisms — 1995-02-10