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Which group of arthropods includes spiders and ticks?

  1. Insects

  2. Arachnids

  3. Crustaceans

  4. Myriapods

The correct answer is: Arachnids

The group of arthropods that includes spiders and ticks is Arachnids. Arachnids are characterized by having eight legs, a body divided into two main segments (the cephalothorax and abdomen), and typically lack antennae. This distinguishes them clearly from other arthropod groups such as insects, which have six legs and three main body segments, and myriapods, which include creatures like centipedes and millipedes with numerous legs. Crustaceans, such as crabs and lobsters, are another distinct group known for their typically aquatic habitats and two pairs of antennae. Understanding these classifications helps in identifying and studying the various roles and characteristics of different arthropods in ecology and pest management.