Spider characteristics include:

Spiders are classified as arachnids, and one of their foundational characteristics is the presence of eight legs. This differentiates them from insects, which typically have six legs. Additionally, spiders possess two distinct body regions: the cephalothorax (which combines the head and thorax) and the abdomen. This segmentation is characteristic of arachnids and is crucial for understanding their anatomy and classification within the animal kingdom.

The other options do not accurately reflect the characteristics of spiders. For instance, having zero wings is true, but the mention of four legs is incorrect due to the established presence of eight legs. Similarly, spiders do not have six legs and three body regions, which aligns with insect anatomy instead. Lastly, the presence of two antennae and sucking mouthparts pertains to different groups of arthropods, such as insects, and is not a feature of spiders. Understanding these specifics helps reinforce the understanding of arachnid biology, highlighting the distinguishing traits that categorize spiders within their class.