Hemichordates differ from echinoderms in that
A) echinoderms have a bilaterally symmetric stage; hemichordates do not.
B) hemichordates have bodies composed of three parts: proboscis, collar, and trunk; echinoderms do not.
C) adult echinoderms have a head; hemichordates do not.
D) adult echinoderms have an anterior-posterior body plan; hemichordates do not.
E) adult hemichordates have radial symmetry; hemichordates do not.
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