Choose the animals which exhibits the following characteristics
(a) Marine habitat.
(b) Bilateral symmetry and cephalization .
( c) Hemocoel as principal body cavity .
(d) Eyes similar to that of vertebrates .

Options

A. Silverfish
B. Dogfish
C. Jellyfish
D. Cuttle fish

Answer

To solve the question, we need to identify an animal that exhibits the following characteristics:

### Step-by-Step Solution:

1. **Identify the Marine Habitat**:
- The animal must live in a marine environment (saltwater). This rules out any terrestrial or freshwater organisms.

2. **Check for Bilateral Symmetry and Cephalization**:
- Bilateral symmetry means that the organism can be divided into two equal halves along a central axis.
- Cephalization refers to the concentration of nervous tissue and sensory organs at one end of the body, typically the head.

3. **Determine if Hemocoel is the Principal Body Cavity**:
- Hemocoel is a fluid-filled body cavity found in certain invertebrates, particularly arthropods and mollusks. It is essential to confirm that the organism possesses this feature.

4. **Look for Eyes Similar to Vertebrates**:
- The organism must have eyes that are structurally or functionally similar to those found in vertebrates.

5. **Evaluate the Options**:
- **Option 1: Silverfish** - An arthropod, but does not have vertebrate-like eyes.
- **Option 2: Dogfish** - A type of fish (Pisces), lacks hemocoel and vertebrate-like eyes.
- **Option 3: Jellyfish** - Belongs to the phylum Cnidaria, exhibits radial symmetry, not bilateral symmetry.
- **Option 4: Cuttlefish** - A mollusk that lives in marine habitats, exhibits bilateral symmetry and cephalization, has a hemocoel, and possesses eyes similar to vertebrates.

6. **Conclusion**:
- The correct answer is **Option 4: Cuttlefish**. It meets all the specified characteristics.