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5 / 20  Which group of invertebrates is most closely related to vertebrates?
A  cephalochordates
B  echinoderms
C  arthropods
D  urochordates

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Source:  OpenStax, Animals. OpenStax CNX. Mar 20, 2015 Download for free at https://legacy.cnx.org/content/col11771/1.1
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