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Select the following phylum that includes protostome animals that are segmented, bilaterally symmetric, and have a chitinous exoskeleton.

a. Arthropoda
b. Annelida
c. Mollusca
d. Brachiopoda
e. Platyhelminthes

User YanDatsiuk
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The correct answer is a. Arthropoda
User Tscpp
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