Dinosaurs were present during the

Options

A. Jurassic period
B. Devonian period
C. Pernian period
D. Pleistocene period

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks during which geological period dinosaurs were present.

2. **Understand Geological Time Scale**: Dinosaurs existed during a specific era known as the Mesozoic Era. This era is crucial for understanding the timeline of dinosaurs.

3. **Break Down the Mesozoic Era**: The Mesozoic Era is divided into three main periods:
- Triassic Period
- Jurassic Period
- Cretaceous Period

4. **Focus on the Jurassic Period**: The Jurassic Period is particularly significant as it is often referred to as the "Age of Dinosaurs." This period is where dinosaurs thrived and diversified.

5. **Determine the Duration of the Jurassic Period**: The Jurassic Period lasted from approximately 215 million years ago (MYBP) to about 145 million years ago. This timeframe is essential for understanding when dinosaurs were dominant.

6. **Conclusion**: Based on the information gathered, the correct answer to the question is that dinosaurs were present during the **Jurassic Period**.

### Final Answer:
Dinosaurs were present during the **Jurassic Period**.

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