How many body parts do spiders have?

Spiders are classified as arachnids, and one of their defining characteristics is their body structure, which consists of two main parts: the cephalothorax and the abdomen. The cephalothorax is a fused head and thorax that houses important organs such as the eyes, mouthparts, and legs, while the abdomen contains the digestive and reproductive organs. This bipartite body structure is a distinguishing feature that separates arachnids, including spiders, from insects, which typically have three body segments (head, thorax, and abdomen). Thus, the correct answer reflects the unique biological classification of spiders as having two primary body segments.