Which of the following is not a feature of amphibians ?

Options

A. Dry skin that resists desiccation
B. Metamorphosis from a swimming form to a land form
C. Small lungs and a supplemental way of gas exchange
D. Reproduction in the water

Explanation

To determine which of the following is not a feature of amphibians, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Amphibian Skin**:
- Amphibians are characterized by having moist, glandular, and naked skin. This skin type is essential for their respiration and helps in moisture absorption.
- **Option Analysis**: "Dry skin that resists desiccation" is incorrect as amphibians do not have dry skin.

2. **Metamorphosis**:
- Amphibians undergo metamorphosis, transitioning from a larval stage (usually aquatic with gills) to an adult stage (terrestrial).
- **Option Analysis**: "Metamorphosis from a swimming form to a land form" is a correct feature of amphibians.

3. **Respiration**:
- Amphibians possess small lungs and also utilize their skin and mouth lining for gas exchange. This adaptation allows them to breathe in both aquatic and terrestrial environments.
- **Option Analysis**: "Small lungs and a supplemental way of gas exchange" is also a correct feature of amphibians.

4. **Reproduction**:
- Amphibians typically reproduce in water. Their eggs lack a protective covering, making it necessary for them to lay eggs in a moist environment to prevent desiccation.
- **Option Analysis**: "Reproduction in the water" is a true characteristic of amphibians.

5. **Conclusion**:
- After analyzing all the options, the only statement that does not correctly describe amphibians is "dry skin that resists desiccation." Therefore, this is the correct answer to the question.

### Final Answer:
The feature that is not characteristic of amphibians is **"dry skin that resists desiccation."**

---