Two common characters found in Centipede, Cockroach and Crab are

Options

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

Answer

To answer the question regarding the common characters found in centipedes, cockroaches, and crabs, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organisms**: Recognize that centipedes, cockroaches, and crabs all belong to the phylum Arthropoda. This is an important classification that will help us understand their shared characteristics.

2. **Understand Key Characteristics of Arthropoda**: The phylum Arthropoda is characterized by specific features. Two of the most significant characteristics are:
- **Jointed Legs**: All arthropods have legs that are segmented and jointed, allowing for a wide range of movement.
- **Exoskeleton**: Arthropods possess a hard outer covering known as an exoskeleton, which provides protection and support.

3. **Evaluate the Options**: The question provides several options to choose from:
- a. Book lungs and antennae
- b. Compound eyes and anal cerci
- c. Jointed legs and cutaneous exoskeleton
- d. Green gland and trachea

4. **Determine Common Features**:
- **Option a**: Book lungs are not present in all three organisms (only in some arachnids), and while antennae are present in all, they are not a defining characteristic.
- **Option b**: Compound eyes are present in cockroaches and crabs, but not in centipedes, and anal cerci are not common to all three.
- **Option c**: Jointed legs and cutaneous exoskeleton are indeed common to all three organisms.
- **Option d**: Green glands are specific to certain crustaceans and not found in centipedes or cockroaches, while trachea are found in insects but not in all arthropods.

5. **Select the Correct Answer**: Based on the evaluation, the correct answer is **option c: jointed legs and cutaneous exoskeleton** as these are the common characteristics shared by centipedes, cockroaches, and crabs.

### Final Answer:
The two common characters found in centipedes, cockroaches, and crabs are **jointed legs and cutaneous exoskeleton**.

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