Which of the folloWing characteristic is shared by all arthropods :-

Options

A. Complete metamorphosis
B. Wings
C. Jointed appendages
D. Tracheal system

Answer

To determine which characteristic is shared by all arthropods, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Arthropods**:
- Arthropods are a diverse group of invertebrates that include insects, arachnids, myriapods, and crustaceans. They are characterized by certain common features.

2. **Evaluating the First Option - Complete Metamorphosis**:
- Complete metamorphosis refers to a life cycle that includes four distinct stages: egg, larva, pupa, and adult.
- Not all arthropods undergo complete metamorphosis; for example, many insects undergo incomplete metamorphosis (hemimetabolous) where they develop from egg to nymph to adult without a pupal stage.
- Therefore, this option is incorrect.

3. **Evaluating the Second Option - Wings**:
- While many insects have wings, not all arthropods possess them. For instance, ants and many other arthropods do not have wings.
- Thus, this option is also incorrect.

4. **Evaluating the Third Option - Jointed Appendages**:
- One of the defining characteristics of arthropods is the presence of jointed appendages (legs, antennae, etc.).
- This feature is common to all arthropods, making this option correct.

5. **Evaluating the Fourth Option - Tracheal System**:
- The tracheal system is a respiratory system found in many insects, but not all arthropods possess this system. For example, aquatic arthropods like some crustaceans have gills instead.
- Therefore, this option is incorrect.

### Conclusion:
The characteristic shared by all arthropods is **jointed appendages**. Thus, the correct answer is option 3.

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