Lateral line occurs in

Options

A. star fish
B. Jellyfish
C. Dogfish
D. All of the above

Answer

### Step-by-Step Solution:

1. **Understand the Concept of Lateral Line**:
- The lateral line is a sensory organ found in certain aquatic animals. It is composed of epidermal cells and is responsible for detecting motion and electric impulses in the water.

2. **Identify the Function of the Lateral Line**:
- The primary function of the lateral line is to help aquatic vertebrates sense their environment, particularly changes in water movement and pressure, which is crucial for navigation and hunting.

3. **Determine Where Lateral Lines are Found**:
- Lateral lines are typically found in aquatic vertebrates, such as fish and the larvae of amphibians, as they live in water and require these sensory organs for survival.

4. **Evaluate the Options Given in the Question**:
- **Option A: Starfish** - Starfish belong to the phylum Echinodermata and possess a water canal system instead of a lateral line. This option is incorrect.
- **Option B: Jellyfish** - Jellyfish are classified under the phylum Cnidaria and do not have a lateral line; they have a different sensory structure. This option is also incorrect.
- **Option C: Dogfish** - Dogfish are a type of fish that do possess a lateral line system, making this option correct.
- **Option D: All of the above** - Since only one of the options (Dogfish) is correct, this option cannot be true.

5. **Conclusion**:
- The correct answer to the question "Lateral line occurs in" is **Option C: Dogfish**.