Which period is commonly called age of dinosaurs?

Explanation

To answer the question "Which period is commonly called the age of dinosaurs?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Era**: The dinosaurs evolved during the Mesozoic Era. This is the overarching time frame during which dinosaurs existed.

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