How many million years ago, the jaw-less fishes probably evolved ?

Options

A. 250
B. 320
C. 350
D. 500

Explanation

**Step-by-Step Solution:**

1. **Identify the Type of Fish**: The question is about jawless fishes, specifically referring to a group known as Agnatha, which are characterized by the absence of jaws.

2. **Determine the Geological Time Period**: Jawless fishes are believed to have evolved during a specific geological time period known as the Ordovician period.

3. **Establish the Timeline**: The Ordovician period is estimated to have occurred around 485 to 444 million years ago. However, the evolution of jawless fishes is more specifically noted to have occurred approximately 350 million years ago.

4. **Conclusion**: Based on the information gathered, jawless fishes probably evolved around 350 million years ago.

**Final Answer**: Jawless fishes probably evolved about 350 million years ago.

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