The ancestral deuterostome possessed external gills, similar to pharyngeal slits seen in extant deuterostomes.Many adult chordates, such as tunicates (sea squirts) do not possess pharyngeal slits.Why would tunicates (sea squirts) be considered similar to the ancestor of all chordates?
A) The body plan of adult tunicates parallels that of chordates.
B) Tunicate larvae possess the synapomorphies of adult chordates.
C) Tunicates have a lophophore-style mouth.
D) Tunicate larvae are primitive in all of their features.
E) Tunicate adults are very similar to the ancestors of cephalochordates and vertebrates.
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