State one characteristic features of class Reptilia

Explanation

### Step-by-Step Text Solution

1. **Introduction to Class Reptilia**:
- Class Reptilia is a group within the phylum Chordata and is classified under the subphylum Vertebrata. Reptiles are primarily known for their unique adaptations that allow them to thrive in various environments.

2. **General Characteristics of Reptiles**:
- Reptiles are characterized as cold-blooded (ectothermic) animals. They rely on external sources of heat to regulate their body temperature.

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