What is common between earthworm and Periplaneta?

Options

A. Red coloured blood
B. Segmented body
C. Anal styles
D. Malpighian tubules.

Answer

To answer the question "What is common between earthworm and Periplaneta?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Phyla**:
- Earthworm belongs to the phylum **Annelida**.
- Periplaneta (cockroach) belongs to the phylum **Arthropoda**.
- **Commonality**: Both organisms are invertebrates but belong to different phyla.

2. **Examine Blood Composition**:
- Earthworms have red-colored blood due to the presence of **hemoglobin**.
- Periplaneta lacks hemoglobin, resulting in a whitish or pale-colored blood.
- **Commonality**: There is no commonality in blood composition.

3. **Body Segmentation**:
- Earthworms exhibit **metameric segmentation**, which means their body is divided into numerous segments (approximately 100-120).
- Periplaneta has a segmented body as well, but it is divided into three distinct regions: **head, thorax, and abdomen**.
- **Commonality**: Both organisms have a segmented body structure.

4. **Excretory Structures**:
- Earthworms use **nephridia** for osmoregulation and excretion.
- Periplaneta has **Malpighian tubules** for similar functions.
- **Commonality**: There is no commonality in excretory structures.

5. **Conclusion**:
- The only common feature between earthworm and Periplaneta is that both have a **segmented body**.

### Final Answer:
The common characteristic between earthworm and Periplaneta is that both possess a **segmented body**.

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