Which one is not not an insect

Options

A. Housefly
B. Butterfly
C. Spider
D. Moth

Answer

To determine which option is not an insect, we will analyze each option based on their classification in the animal kingdom.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- A) Housefly
- B) Butterfly
- C) Spider
- D) Moth

2. **Classify Each Option**:
- **Housefly**: The housefly belongs to the class Insecta. Insects are characterized by having six legs, compound eyes, and a body divided into three regions: head, thorax, and abdomen.
- **Butterfly**: The butterfly also belongs to the class Insecta. It shares the same characteristics as the housefly.
- **Spider**: The spider belongs to the class Arachnida. Arachnids are characterized by having eight legs, simple eyes, and a body divided into two regions: cephalothorax and abdomen.
- **Moth**: The moth, like the housefly and butterfly, belongs to the class Insecta.

3. **Compare Characteristics**:
- Insects (Housefly, Butterfly, Moth): 6 legs, compound eyes, body divided into three parts.
- Arachnids (Spider): 8 legs, simple eyes, body divided into two parts.

4. **Identify the Non-Insect**: From the analysis, the spider is the only option that does not belong to the class Insecta. It belongs to the class Arachnida.

5. **Conclusion**: Therefore, the correct answer is option C, Spider, as it is not an insect.

### Final Answer:
The option that is not an insect is **C) Spider**.