Step 1: Understand the given groups.
Fish, reptiles, and birds are three distinct classes of animals. Each group has its own unique characteristics and none of these groups overlap with each other.
Step 2: Analyze the relationship among the groups.
- Fish live in water and breathe through gills.
- Reptiles are cold-blooded animals that usually live on land.
- Birds are warm-blooded animals with feathers and wings.
There is no common member that belongs to more than one of these groups.
Step 3: Evaluate the diagrams.
- Option (A) shows overlap between two groups, which is incorrect.
- Option (B) shows three separate circles, indicating no overlap, which correctly represents the relationship.
- Option (C) shows all groups overlapping, which is incorrect.
- Option (D) shows one group inside another, which is also incorrect.
Step 4: Conclusion.
Since fish, reptiles, and birds are completely separate categories with no overlap, the correct diagram is option (B).