In which group of organisms the Cell walls form two thin overlapping shells which fit together?
| 1. | Chrysophytes | 2. | Euglenoids |
| 3. | Dinoflagellates | 4. | Slime moulds |
| 1. | Dinoflagellates | 2. | Diatoms |
| 3. | Cyanobacteria | 4. | Euglenoids |
| 1. | Diatoms | 2. | Dinoflagellates |
| 3. | Euglenoids | 4. | Blue green algae |