Amphibia first appeared in which of the following period?

Options

A. Permian
B. Carboniferous
C. Devonian
D. Silurian

Answer

To determine in which period amphibians first appeared, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Eons and Eras**:
- The geological time scale is divided into eons, eras, and periods. The relevant eons for our question are the Proterozoic and Phanerozoic.

2. **Identify the Relevant Era**:
- The Phanerozoic Eon is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. Since we are looking for the appearance of amphibians, we focus on the Paleozoic Era.

3. **List the Periods in the Paleozoic Era**:
- The Paleozoic Era consists of several periods: Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian.

4. **Determine the Order of the Periods**:
- The order of the periods is as follows: Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian.

5. **Identify the Period of First Appearance of Amphibians**:
- Amphibians are believed to have first appeared during the Devonian period. While the Carboniferous period saw a significant increase in amphibian diversity, the initial appearance is attributed to the Devonian.

6. **Conclude the Answer**:
- Based on the above analysis, the answer to the question is that amphibians first appeared in the **Devonian period**.

### Final Answer:
Amphibia first appeared in the **Devonian period**.

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