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Identify the chordate features that distinguish them from non-chordates.
ANotochord absent; ventral solid double nerve cord; no gill slits; dorsal heart
BOnly the presence of a closed circulatory system
COnly bilateral symmetry
DNotochord present; dorsal hollow nerve cord; pharyngeal gill slits; post-anal tail; ventral heart
Answer & Solution
Correct answer: D. Notochord present; dorsal hollow nerve cord; pharyngeal gill slits; post-anal tail; ventral heart
Chordates fundamentally have: (1) Notochord, (2) Dorsal hollow nerve cord, (3) Pharyngeal gill slits, (4) Post-anal tail, (5) Ventral heart. Non-chordates have ventral solid double nerve cord, no notochord, dorsal heart (if present), no gill slits, no post-anal tail.
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