Related Clues:

• Simple water dweller
• Marine growth
• It creates energy through photosynthesis
• One-celled animal
• Rootless plant
• Real low life?
• Bit of pond scum
• Chlorophyllous organism
• Simple life
• Plankton part
• Aquarium organism
• Microscopic pond organism
• Single-celled protozoan
• Pond problem
• Simple lab specimen