Epidermal scale is the characteristic feature of class Reptilia. Which of the following classes is without epidermal outgrowths

Options

A. fish
B. aves
C. mammals
D. amphibians

Answer

To solve the question "Epidermal scale is the characteristic feature of class Reptilia. Which of the following classes is without epidermal outgrowths?" we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Characteristics of Class Reptilia**:
- Reptiles are characterized by having dry and cornified skin.
- They possess epidermal scales, which are outgrowths of the epidermis.
- Reptiles do not have external ears.

2. **Analyze the Given Options**:
- **Fish**: Fish have scales, which are also epidermal outgrowths. Therefore, they do not fit the criteria of being without epidermal outgrowths.
- **Evs (Birds)**: Birds have feathers, which are considered epidermal outgrowths. Thus, they are also not the correct answer.
- **Mammals**: Mammals have hair and other epidermal structures, which are also epidermal outgrowths. Hence, they do not meet the requirement.
- **Amphibians**: Amphibians have smooth skin and do not have scales or any significant epidermal outgrowths. They typically have mucous glands in their skin but lack the epidermal scales found in reptiles.

3. **Identify the Correct Answer**:
- Based on the analysis, the only class that does not have epidermal outgrowths is **Amphibians**. They have smooth skin and do not possess scales or other epidermal structures.

4. **Conclusion**:
- Therefore, the correct answer to the question is **Amphibians**.

### Final Answer:
The class without epidermal outgrowths is **Amphibians**.

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