Which of the following period is known as age of amphibians?

Options

A. Ordovician
B. Devonian
C. Carboniferous
D. Cambrian

Answer

To determine which period is known as the Age of Amphibians, we can analyze the options provided:

1. **Ordovician Period**: This period occurred around 485 to 443 million years ago. It is characterized by the dominance of marine invertebrates, particularly brachiopods and trilobites. Amphibians were not prominent during this time.

2. **Devonian Period**: Known as the Age of Fishes, this period lasted from about 419 to 359 million years ago. It is marked by the diversification of fish species and the emergence of early tetrapods, but it is not specifically recognized for amphibians.

3. **Carboniferous Period**: This period spans from approximately 359.2 to 299 million years ago. It is during this time that amphibians became more prevalent and diversified. Hence, it is referred to as the Age of Amphibians.

4. **Cambrian Period**: This period occurred around 541 to 485 million years ago and is known for the Cambrian explosion, which saw a rapid increase in the diversity of life forms, including early chordates. However, amphibians did not exist during this time.

Based on this analysis, the correct answer is the **Carboniferous Period**, which is known as the Age of Amphibians.

### Step-by-Step Solution:
1. **Identify the periods listed in the options**: Ordovician, Devonian, Carboniferous, and Cambrian.
2. **Research the characteristics of each period**:
- **Ordovician**: Dominated by marine invertebrates.
- **Devonian**: Known as the Age of Fishes.
- **Carboniferous**: Known as the Age of Amphibians.
- **Cambrian**: Notable for the Cambrian explosion and early chordates.
3. **Determine which period is associated with amphibians**: The Carboniferous Period is recognized for the rise and diversification of amphibians.
4. **Conclude with the correct answer**: The Carboniferous Period is known as the Age of Amphibians.