Which of the following is a primary characteristic that distinguishes Urochordata (Tunicates) from other protochordates?
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Correct answer: The notochord is present only in the larval tail and resorbed at metamorphosis
In urochordates, the chordate hallmarks — notochord and dorsal hollow nerve cord — are found in the free-swimming larva. During 'retrogressive metamorphosis' into a sessile adult, the tail is resorbed and these structures largely disappear, leaving only the pharyngeal basket and tunic.
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