In sea squirts, which feature is lost as the larva metamorphoses into the sessile adult?
AThe mucus-secreting endostyle
BThe tail and notochord
CThe pharyngeal gill slits
DThe muscular body wall
Answer & Solution
Correct answer: B. The tail and notochord
Adult sea squirts lose the notochord, nerve cord and tail, while the filter-feeding pharynx with gill slits remains.
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