Which one of the animals does not have a segmented body ?

Options

A. Tapeworm
B. Glow worm
C. Earthworm
D. Ship worm

Answer

To determine which animal does not have a segmented body, we can analyze the options provided based on their classification in different phyla. Here’s a step-by-step solution:

### Step 1: Understand the Concept of Segmentation
Segmentation refers to the division of an organism's body into repetitive segments. This feature is commonly found in various animal phyla, including Annelida, Arthropoda, and Platyhelminthes.

### Step 2: Review the Options
We need to evaluate each option to see if it belongs to a phylum that exhibits segmentation or not.

1. **Tapeworm**:
- Classification: Phylum Platyhelminthes (Class Cestoda)
- Segmentation: Tapeworms have a segmented body, as they are composed of numerous segments called proglottids.

2. **Glowworm**:
- Classification: Phylum Arthropoda (Class Insecta)
- Segmentation: Glowworms, like other arthropods, have a segmented body structure.

3. **Earthworm**:
- Classification: Phylum Annelida
- Segmentation: Earthworms are classic examples of segmented organisms, with their bodies divided into metameric segments.

4. **Shivworm**:
- Classification: Phylum Mollusca (Class Bivalvia)
- Segmentation: Molluscs, including Shivworms, do not exhibit body segmentation. Their bodies are not divided into segments.

### Step 3: Identify the Correct Answer
Based on the analysis, the animal that does not have a segmented body is the **Shivworm** from the phylum Mollusca.

### Final Answer:
**Shivworm (Phylum Mollusca)** does not have a segmented body.

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