What differentiates arachnids from insects in terms of body structure?

Arachnids are indeed differentiated from insects based on their body structure, and they typically have two main body parts: the cephalothorax and the abdomen. The cephalothorax comprises the head and the thorax, which is a key characteristic of arachnids. In contrast, insects possess three distinct body segments: the head, thorax, and abdomen.

The two body parts in arachnids also serve distinct functions. The cephalothorax contains important structures such as the eyes, mouthparts, and legs, while the abdomen contains the digestive and reproductive organs. This structural adaptation is significant for their survival and ecological roles as predators or scavengers.

Other incorrect options highlight characteristics not applicable to arachnids. For example, arachnids are equipped with eight legs, unlike insects, which have six. They also do not have wings, which further sets them apart from many insects that are capable of flight. Thus, the identification of arachnids having two body parts captures the fundamental differences in their body structure when compared to insects.