Q. Among the following organisms, which one does NOT belong to the class of the other three?

1. Butterfly
2. Mosquito
3. Ant
4. Spider

Select the correct answer using the codes given below:
Answer: Only 4
Notes: Butterflies, mosquitoes, and ants are insects, all belonging to the class Insecta (Hexapoda) with six legs and three-part bodies. Spiders belong to a different class, Arachnida, characterized by eight legs and two main body segments. Spiders are arthropods but are not insects, distinguishing them from the other three organisms listed.