Which class includes mites, ticks, scorpions, and spiders?

• A. Insect
• B. Arachnid
• C. Crustacean
• D. Mollusk

Answer: (B)

Mites, ticks, scorpions, and spiders all belong to the same class because they share key features of arachnids: eight legs, two main body sections (a combined cephalothorax and abdomen), and no antennae. These traits set them apart from insects, which have six legs, three body parts, and usually antennae; crustaceans, which typically have multiple legs and two antennae and are mostly aquatic; and mollusks, which are a different animal group altogether with soft bodies and often shells. So, the best answer is the group that unites all these eight-legged characters: arachnids.