Which of the following trait is not characteristic of frog:-

Options

A. Thin, scaleless skin
B. Aquatic reproduction
C. Ammiote egg
D. Cutaneous respiration

Answer

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which trait is not characteristic of frogs among the given options.

2. **Analyze the Options**:
- **Option 1**: Thin and scaleless skin.
- **Option 2**: Aquatic Reproduction.
- **Option 3**: Amniotic.
- **Option 4**: Cutaneous Respiration.

3. **Evaluate Each Option**:
- **Option 1**: Frogs do have thin and scaleless skin, which is characteristic of their physiology.
- **Option 2**: Frogs reproduce in water, making aquatic reproduction a characteristic of frogs.
- **Option 3**: Amniotic eggs are characteristic of terrestrial animals that lay eggs on land. Frogs do not have amniotic eggs; they lay eggs in water without the protective amnion.
- **Option 4**: Frogs breathe through their skin (cutaneous respiration), which is a known characteristic.

4. **Identify the Correct Answer**: Since frogs do not possess amniotic eggs, **Option 3 (Amniotic)** is the trait that is not characteristic of frogs.

### Final Answer:
The trait that is not characteristic of frogs is **Amniotic** (Option 3).

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