A characterstic feature of scorpions is

Options

A. 4 pairs of walking legs
B. Vivipary
C. Chelicerae
D. Pedipalpi.

Answer

To answer the question about a characteristic feature of scorpions, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Classification of Scorpions**:
- Scorpions belong to the phylum Arthropoda and the subphylum Chelicerata. They are classified under the class Arachnida.

2. **Understand the Appendages**:
- Scorpions have a total of six pairs of appendages. This includes four pairs of walking legs and two pairs of mouthparts (chelicerae and pedipalps).

3. **Identify Key Features**:
- The first pair of appendages are chelicerae, which are used for feeding.
- The second pair are pedipalps, which are often used for grasping prey and can also have sensory functions.

4. **Evaluate the Options**:
- The options given are:
1. Four pairs of walking legs
2. Vivipary (giving birth to live young)
3. Chelicerae
4. Pedipalps
- All these features are indeed characteristics of scorpions, but we need to identify the most characteristic feature.

5. **Determine the Most Characteristic Feature**:
- While all options are correct, the term "chelicerae" is particularly significant as it is the defining feature of the subphylum Chelicerata, which scorpions belong to. Therefore, it is the most appropriate answer.

### Final Answer:
The most characteristic feature of scorpions is **chelicerae** (Option 3).

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