Ichthyosaurs evolved around

Options

A. 200 mya
B. 350 mya
C. 500 mya
D. 600 mya

Answer

**Step-by-Step Solution:**

1. **Understanding Ichthyosaurs**: Ichthyosaurs were a group of marine reptiles that resembled modern-day dolphins and whales. They are important in the study of evolution as they represent a significant adaptation of reptiles to a marine environment.

2. **Time of Evolution**: Ichthyosaurs are believed to have evolved around 250 million years ago. This places their emergence in the Mesozoic Era, which is often referred to as the "Age of Reptiles."

3. **Mesozoic Era Context**: The Mesozoic Era is divided into three periods: Triassic, Jurassic, and Cretaceous. Ichthyosaurs were particularly abundant during the late Triassic and early Jurassic periods.

4. **Analyzing the Options**: The question provides four options: 200 million years, 350 million years, 500 million years, and 600 million years. Since Ichthyosaurs evolved around 250 million years ago, the closest option is 200 million years.

5. **Conclusion**: Therefore, the correct answer to the question "Ichthyosaurs evolved around" is approximately 200 million years ago.

**Final Answer**: 200 million years ago.

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