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

Question

Quizplus · Accepted Answer

Arthropoda is the only phylum listed that fits all three criteria: protostome animals that are segmented, bilaterally symmetric, and have a chitinous exoskeleton. Annelida are also protostomes and segmented, but they do not have a chitinous exoskeleton. Mollusca and Brachiopoda are both bilaterally symmetric, but they are not segmented and do not have a chitinous exoskeleton. Platyhelminthes are also bilaterally symmetric and protostomes, but they are not segmented and do not have a chitinous exoskeleton.

Select the Following Phylum That Includes Protostome Animals That Are