Which one of the following groups of three animals is correctly matched with their one characteristic morphological feature?

Options

A. `{:("Animals","Morphological features"),("Scorpion, spider cockroach",-"Ventral solid central nervous system"):}`
B. `{:("Animals","Morphological features"),("Cockroach,locust,Taenia",-"Metameric segmentation "):}`
C. `{:("Animals","Morphological features"),("Liver fluke, sea anemone, sea cucumber",-"Bilateral symmetry "):}`
D. `{:("Animals","Morphological features"),("Centipede,prawn,sea urchin",-"Jointed appendages "):}`

Explanation

To solve the question regarding which group of three animals is correctly matched with their characteristic morphological feature, let's analyze each option step by step.

### Step 1: Identify the Animals and Their Features

1. **Group 1: Scorpion, Spider, Cockroach**
- **Morphological Feature:** Ventral solid central nervous system (CNS).

2. **Group 2: Cockroach, Locus, Taenia**
- **Morphological Feature:** Metameric segmentation.

3. **Group 3: Liver Fluke, Sea Anemone, Sea Cucumber**
- **Morphological Feature:** Bilateral symmetry.

4. **Group 4: Centipede, Prawn, Sea Urchin**
- **Morphological Feature:** Jointed appendages.

### Step 2: Analyze Each Group

- **Group 1 (Scorpion, Spider, Cockroach):**
- All these animals belong to the phylum Arthropoda and have a ventral solid central nervous system. This feature is characteristic of many arthropods.

- **Group 2 (Cockroach, Locus, Taenia):**
- Cockroach belongs to Arthropoda, but Locus (likely referring to locust) is also an arthropod, while Taenia is a genus of parasitic flatworms (Platyhelminthes) and does not exhibit metameric segmentation in the same sense as annelids. This group is incorrectly matched.

- **Group 3 (Liver Fluke, Sea Anemone, Sea Cucumber):**
- Liver fluke is a flatworm (Platyhelminthes) and exhibits bilateral symmetry, while sea anemone has radial symmetry, and sea cucumber also has radial symmetry. Therefore, this group is incorrectly matched.

- **Group 4 (Centipede, Prawn, Sea Urchin):**
- Centipede and prawn are arthropods with jointed appendages, but sea urchin is an echinoderm and does not have jointed appendages. Thus, this group is incorrectly matched.

### Step 3: Conclusion

The only group that is correctly matched with their characteristic morphological feature is **Group 1: Scorpion, Spider, Cockroach** with the feature of a **ventral solid central nervous system**.

### Final Answer:
**Option A: Scorpion, Spider, Cockroach - Ventral solid central nervous system.**

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