One of the following is not an amphibian

Options

A. Frog
B. Toad
C. Salamander
D. Tortoise

Answer

To determine which of the following options is not an amphibian, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Amphibians**: Amphibians are a class of animals that typically have a life cycle that includes both aquatic (larval) and terrestrial (adult) stages. They usually have moist skin and are often found in both water and on land.

2. **Identify the Subclasses of Amphibians**: There are three main subclasses of amphibians:
- **Anura**: This subclass includes frogs and toads, which do not have tails as adults.
- **Urodela**: This subclass includes salamanders, which typically have tails and may have rudimentary eyes.
- **Apoda**: This subclass includes caecilians, which are limbless and resemble worms.

3. **Examine the Options**: The question provides four options, and we need to identify which one does not belong to the amphibian class.
- **Frog and Toad**: These belong to the Anura subclass and are indeed amphibians.
- **Salamander**: This belongs to the Urodela subclass and is also an amphibian.
- **Tauterize**: This is not an amphibian; it belongs to the class Reptilia, specifically the order Testudines (turtles), which are primarily terrestrial and have a hard, scaly covering.
- **Caecilian**: This belongs to the Apoda subclass and is also an amphibian.

4. **Conclusion**: Based on the analysis, the option that is not an amphibian is **Tauterize**.

### Final Answer:
The organism that is not an amphibian is **Tauterize**.

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