Two common characters found in Centipede, Cockroach and Crab are

Options

A. Jointed legs and chtinous exoskeleton
B. Green glands and tracheae
C. Book lungs and antennae
D. Compound eyes and anal cerci.

Answer

To answer the question regarding the two common characters found in Centipede, Cockroach, and Crab, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Phylum**:
- All three organisms (Centipede, Cockroach, and Crab) belong to the phylum Arthropoda. This is the first step in understanding their common characteristics.

2. **Common Characteristics of Arthropods**:
- Arthropods are known for certain defining features. Two of the most significant characteristics are:
- **Jointed Appendages**: This refers to the presence of jointed legs or limbs, which is a hallmark of arthropods.
- **Chitinous Exoskeleton**: Arthropods have an external skeleton made of chitin, which provides structure and protection.

3. **Verification**:
- Check if both characteristics are present in all three organisms:
- **Centipede**: Has jointed legs and a chitinous exoskeleton.
- **Cockroach**: Also has jointed legs and a chitinous exoskeleton.
- **Crab**: Possesses jointed legs and a chitinous exoskeleton as well.

4. **Conclusion**:
- Since both jointed appendages and chitinous exoskeleton are found in Centipede, Cockroach, and Crab, these are the two common characters.

### Final Answer:
The two common characters found in Centipede, Cockroach, and Crab are:
1. Jointed Appendages
2. Chitinous Exoskeleton

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