| Aquatic organism |
| One who studies minute organisms |
| Microscopic organism |
| Amorphous organism |
| Oxygen-requiring microorganism |
| Microorganism's locomotion |
| Microorganisms |
| Birdbath buildup |
| All organisms in one area, collectively |
| A studier of living organisms |
| Bacterial organism |
| Activity of an organism in response to light, e.g. |
| Living organisms |
| Organism needing air to exist |
| Genetically related organisms |
| Birdbath organism |
| Tiny aquatic organism |
| Birdbath greenery? |
| Group of genetically similar organisms |
| Like some single-celled organisms |
| Aquarium organism |
| Group of organisms |
| Useful microorganisms |
| Bottom-of-the-food-chain organisms |
| Simple aquatic organisms |
| Microorganisms in bread |
| Organism needing oxygen |
| Birdbath? |
| Modified organisms |
| Like all living organisms |