What was the reason of mass extinction during Mesozoic era?

Options

A. Due to meteorite falling on earth
B. Due to continental drift
C. Glaciation
D. Volcanic eruption

Answer

### Step-by-Step Solution:

1. **Understanding the Mesozoic Era**: The Mesozoic Era lasted from approximately 252 to 66 million years ago and is often referred to as the "Age of Reptiles," during which dinosaurs were the dominant terrestrial vertebrates.

2. **Identifying the Periods of the Mesozoic Era**: The Mesozoic Era is divided into three main periods:
- Triassic (approximately 252 to 201 million years ago)
- Jurassic (approximately 201 to 145 million years ago)
- Cretaceous (approximately 145 to 66 million years ago)

3. **Recognizing Mass Extinction Events**: The most significant mass extinction event during the Mesozoic Era occurred at the end of the Cretaceous period, around 66 million years ago. This event is known as the Cretaceous-Paleogene (K-Pg) extinction event.

4. **Exploring Causes of Mass Extinction**: Several hypotheses have been proposed regarding the cause of this mass extinction, including:
- Meteorite impact
- Volcanic activity
- Climate change
- Sea level changes

5. **Identifying the Correct Cause**: Among the proposed causes, the most widely accepted explanation for the mass extinction at the end of the Cretaceous period is the impact of a large meteorite (or asteroid) that struck the Earth, leading to catastrophic environmental changes.

6. **Conclusion**: Therefore, the primary reason for the mass extinction during the Mesozoic Era, particularly at the end of the Cretaceous period, is attributed to a meteorite impact on Earth.

### Final Answer:
The reason for mass extinction during the Mesozoic Era was primarily due to a meteorite impact on Earth.

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