Gastrovascular cavity is not the characteristic feature of

Options

A. Adamsia
B. Aurelia
C. Hydra
D. Cliona

Answer

To solve the question regarding which organism does not have a gastrovascular cavity as a characteristic feature, we can follow these steps:

### Step 1: Understand the Concept of Gastrovascular Cavity
- The gastrovascular cavity is an organ that serves both digestive and circulatory functions in certain animals. It is primarily found in specific phyla.

### Step 2: Identify the Phyla with Gastrovascular Cavities
- The gastrovascular cavity is a characteristic feature of:
- **Cnidarians (Cilentrata)**: This includes organisms like jellyfish (Aurelia) and hydra.
- **Platyhelminthes**: This includes flatworms.

### Step 3: Analyze the Given Options
- The question provides several options, including:
1. Adamtia (Cnidarian)
2. Aurelia (Cnidarian)
3. Hydra (Cnidarian)
4. Cliona (Porifera)

### Step 4: Determine the Correct Answer
- **Adamtia, Aurelia, and Hydra** all belong to the phylum Cnidaria and possess a gastrovascular cavity.
- **Cliona**, on the other hand, belongs to the phylum Porifera (sponges), which do not have a gastrovascular cavity. Instead, sponges rely on a constant flow of water for their metabolic processes.

### Conclusion
- Therefore, the correct answer to the question "Gastrovascular cavity is not the characteristic feature of" is **Cliona**.

### Final Answer
- **Cliona** (Option 4) is the organism that does not have a gastrovascular cavity as a characteristic feature.

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