A universal characteristic of insects is

Options

A. Two pair of wings
B. Two pair of antennae
C. Two pair of antennae
D. Three pairs of thoracic legs

Answer

**Step-by-Step Solution:**

1. **Understanding Insects**: Insects belong to the class Insecta within the phylum Arthropoda. They are characterized by their invertebrate nature and specific anatomical features.

2. **Identifying Key Features**: Insects have a chitinous exoskeleton, which provides structural support and protection. They also have a body divided into three main parts: the head, thorax, and abdomen.

3. **Legs of Insects**: A universal characteristic of insects is that they possess three pairs of jointed legs. This means that all insects have a total of six legs, which are attached to the thorax.

4. **Other Features**: Insects typically have one pair of antennae and compound eyes. However, the number of wings can vary among different insect species (some have two pairs, while others may have one or none).

5. **Conclusion**: Given the options provided, the correct answer to the question about the universal characteristic of insects is "3 pairs of thoracic legs."

**Final Answer**: The universal characteristic of insects is 3 pairs of thoracic legs.

---