An important characteristic that Hemichordates share with Chordates is :

1. ventral tubular nerve cord

2. pharynx with gill slits

3. pharynx without gill slits

4. absence of notochord

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Answer: 2. pharynx with gill slits

Key idea: Hemichordates (e.g. Balanoglossus) share pharyngeal gill slits with chordates.

(1) Hemichordates have a mainly solid, dorsal and ventral nerve cord, not a ventral tubular one; chordates have a dorsal tubular cord.
(2) Both groups have a pharynx with gill slits. This is the shared character.
(3) A pharynx without slits is not true of hemichordates.
(4) Absence of a notochord marks a difference, not a shared feature.

Answer: (2).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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