AP BIOLOGY

Detailed explanation-1: -Answer and Explanation: The correct answer is (E). The nautilus is from the phylum Mollusca. You can tell that the nautilus is not an arthropod because it does not have an exoskeleton or paired, segmented legs, like crabs, trilobites, centipedes, and mites do.

Detailed explanation-2: -Many familiar species belong to the phylum Arthropoda-insects, spiders, scorpions, centipedes, and millipedes on land; crabs, crayfish, shrimp, lobsters, and barnacles in water (Fig. 3.72). Arthropods are considered the most successful animals on Earth.

Detailed explanation-3: -arthropod, (phylum Arthropoda), any member of the phylum Arthropoda, the largest phylum in the animal kingdom, which includes such familiar forms as lobsters, crabs, spiders, mites, insects, centipedes, and millipedes.