Which of the following organisms is known to be a jawless vertebrate ?

Options

A. Petrmyzon
B. Scoliodon
C. Pristis
D. Trygon

Answer

To determine which of the listed organisms is a jawless vertebrate, we can analyze each option provided in the question.

### Step 1: Identify the Organisms
The organisms listed are:
1. Patrimyzone
2. Scoliodon
3. Pristis
4. Trigon

### Step 2: Analyze Each Organism
- **Scoliodon**: This is a type of shark, which is a cartilaginous fish. Sharks possess jaws, so Scoliodon is not a jawless vertebrate.

- **Pristis**: Commonly known as sawfish, Pristis has a jaw and teeth. Therefore, it is also not a jawless vertebrate.

- **Trigon**: This refers to a type of ray fish, which has a jaw and is not classified as a jawless vertebrate.

- **Patrimyzone**: This is a type of jawless fish, specifically belonging to the class Agnatha. Jawless fish are characterized by the absence of jaws and include organisms such as lampreys and hagfish.

### Step 3: Conclusion
Based on the analysis, the only organism among the options that is known to be a jawless vertebrate is **Patrimyzone**.

### Final Answer
**Patrimyzone** is the organism known to be a jawless vertebrate.

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