A student observes an organism with the following features: a 2-part body (cephalothorax and abdomen), more than 4 pairs of jointed legs, an exoskeleton formed from hardened calcium, and it breathes through gills. To which arthropod class does this organism belong?
1 )
Insects
2 )
Arachnids
Crustaceans
4 )
Myriapods
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