Most dinosaurs became extinct in

Options

A. early triassic
B. late triassic
C. late jurassic
D. cretaceous

Answer

To answer the question about when most dinosaurs became extinct, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks when most dinosaurs became extinct. We need to identify the specific geological period associated with their extinction.

2. **Identifying the Era of Dinosaurs**: Dinosaurs thrived during the Mesozoic Era, which is divided into three geological periods: Triassic, Jurassic, and Cretaceous.

3. **Examining Each Period**:
- **Triassic Period**: This is the earliest period of the Mesozoic Era, where dinosaurs first appeared.
- **Jurassic Period**: This period is known for the diversification of dinosaurs but does not mark their extinction.
- **Cretaceous Period**: This is the last period of the Mesozoic Era, and it is significant for the mass extinction event that led to the demise of most dinosaur species.

4. **Identifying the Extinction Event**: The mass extinction event that wiped out the dinosaurs occurred at the end of the Cretaceous Period, approximately 65 million years ago.

5. **Conclusion**: Based on the information gathered, we conclude that most dinosaurs became extinct during the Cretaceous Period.

### Final Answer:
Most dinosaurs became extinct in the **Cretaceous Period**.

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