Explain how animals in Vertebrata are classified into further subgroups.

Explanation

To explain how animals in the subphylum Vertebrata are classified into further subgroups, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Vertebrata**:
- Vertebrates are animals that have a backbone or spinal column. This group includes a wide variety of animals.

2. **Basis of Classification**:
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