Related Clues:

• Tiny quantity
• Bio 101 subject
• Single-celled blob
• Tick
• One that lives in a single cell?
• Tiny critter
• Blob
• Biology 101 subject (Var.)
• Tiny organism (Var.)
• One-celled protozoan (Var.)
• Slide subject
• It bites the dust
• Arachnid
• Teeny amount
• Organism on a slide