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Arthropods are the largest phylum of animals. All arthropods have jointed legs and a segmented body, or a body of separate sections. Arthropods include arachnids, crustaceans and insects. Arachnids usually have eight legs and no wings or antennae. Spiders and scorpions are examples. Crustaceans are arthropods with hard exoskeletons outside their bodies. Lobsters and crabs are examples of crustaceans. Insects have exoskeletons, too. Insects are arthropods that usually have wings, six legs and a head, thorax and abdomen.
Koreana can’t tell if an organism is a crustacean or an insect. Which of these should she ask?
a. Does it have wings?
b. Does it have jointed legs?
c. Does it have a backbone?
d. Does it have an exoskeleton?
Answers: 1
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