Which arthropod group is distinguished by having two pairs of antennae and biramous appendages?
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Correct answer: Crustacea
Crustaceans are uniquely distinguished within Arthropoda by possessing two pairs of antennae (antennules and antennae). Their appendages are also typically biramous — each splitting into an inner endopodite and an outer exopodite — which is associated with aquatic locomotion and filter-feeding.
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