What makes a reptile a reptile?

Options

A. Cold blooded
B. Warm blood
C. Non-Hearing
D. Egg-laying

Explanation

### Step-by-Step Solution:

1. **Definition of Reptiles**: Reptiles are a class of animals that include species such as crocodiles, snakes, and lizards. They are characterized by specific traits that distinguish them from other animal classes.

2. **Cold-Blooded Nature**: One of the primary characteristics of reptiles is that they are cold-blooded (ectothermic). This means that their body temperature is not constant and varies with the temperature of their environment. Unlike warm-blooded animals (like mammals), reptiles rely on external sources of heat to regulate their body temperature.

3. **Skin and Scales**: Reptiles have dry skin covered with scales. These scales help to prevent water loss, making reptiles well-suited for life on land. The dry, scaly skin is a significant adaptation that differentiates reptiles from amphibians, which typically have moist skin.

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