Which important characteristic do hemichordates share with chordates?
Correct answer: B. Pharynx with gill slits
- A. Ventral tubular nerve cord
- B. Pharynx with gill slits
- C. Pharynx without gill slits
- D. Absence of notochord
Explanation
An important characteristic that hemichordates and chordates share is the presence of pharyngeal gill slits. Gill slits are dorsal in position in hemichordates whereas they are lateral in chordates. A true notochord does not occur in hemichordates. The nervous system is distinct from the vertebrate type being intraepidermal in position and having a ventral nerve cord.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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