Dianosaurs dominated the world in which of the following geological era?

Options

A. Devonion
B. Coenozoic
C. Jurassic period
D. Mesozoic.

Answer

To determine in which geological era dinosaurs dominated the world, we can follow these steps:

### Step 1: Understand Geological Eras
Geological time is divided into three major eras: Paleozoic, Mesozoic, and Cenozoic.

### Step 2: Identify the Era of Dinosaurs
Dinosaurs primarily existed during the Mesozoic era, which is often referred to as the "Age of Reptiles." This era is further divided into three periods: Triassic, Jurassic, and Cretaceous.

### Step 3: Analyze the Options
- **Devonian**: This is a period within the Paleozoic era, and dinosaurs did not exist during this time.
- **Cenozoic**: This era is known as the "Age of Mammals," and dinosaurs had already disappeared by this time.
- **Jurassic Period**: While dinosaurs were dominant during this period, the question asks for the era, not the specific period.
- **Mesozoic**: This era is where dinosaurs thrived and dominated the Earth.

### Step 4: Conclusion
Since the question asks for the geological era in which dinosaurs dominated, the correct answer is the **Mesozoic era**.

### Final Answer
**Mesozoic Era** (Option D)

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