Starfish does not possess

Options

A. Mouth
B. Anus
C. Head
D. Arms

Answer

To answer the question "Starfish does not possess," we will analyze the characteristics of starfish (which belong to the phylum Echinodermata) and identify what they lack.

### Step-by-Step Solution:

1. **Identify the Phylum**: Starfish belong to the phylum Echinodermata. This phylum is characterized by a spiny body structure due to the presence of calcareous ossicles.

2. **Examine Body Structure**: Echinoderms, including starfish, have a unique body structure. They possess a central disc and arms (usually five in starfish). The presence of these arms is a notable feature.

3. **Digestive System**: Echinoderms typically have a complete digestive system, which means they possess both a mouth and an anus. However, brittle stars are an exception as they have an incomplete digestive system.

4. **Water Vascular System**: Starfish have a water vascular system, which is crucial for locomotion and respiration. This system includes structures like the madreporite, which allows water to enter and exit.

5. **Presence of Head**: A significant characteristic of starfish is that they do not have a distinct head. Unlike many other organisms, the body of a starfish is radially symmetrical, and there is no centralized head region.

6. **Conclusion**: Based on the analysis, the feature that starfish do not possess is a head. Therefore, the correct answer to the question is that starfish do not possess a head.

### Final Answer:
Starfish does not possess a head.

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