In which era reptiles were dominant ?

Options

A. Coenozoic era
B. Mesozoic era
C. Paleozoic era
D. Archaezoic era

Explanation

To determine in which era reptiles were dominant, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Era of Reptile Dominance**:
- Reptiles, particularly dinosaurs, became the dominant terrestrial vertebrates during a specific geological time frame.

2. **Recognize the Relevant Period**:
- The Mesozoic Era is known as the "Age of Reptiles." This era is divided into three periods: Triassic, Jurassic, and Cretaceous.

3. **Focus on the Triassic and Jurassic Periods**:
- The Triassic period is when the first dinosaurs appeared, but they were not yet dominant.
- The Jurassic period followed the Triassic and is when dinosaurs became the dominant reptiles on Earth.

4. **Conclude the Dominance**:
- Therefore, the Jurassic period of the Mesozoic Era is recognized as the time when reptiles, particularly dinosaurs, were dominant.

5. **Final Answer**:
- The correct answer is the Jurassic period of the Mesozoic Era.