hemichordates have now been placed with the non-chordates , close to echinoderms,because true a. notochord is absent
b. pharyngeal gill slits
c. dorsal nerve cord is absent
d. heart is lacking
choose from the options..

Dear student,
Please find below the solution to the asked query

The correct option is a.

Hemichordates have been now placed with non chordates because they lack a true notochord. There is a rudimentary structure instead of a notochord called stomochord. However, they posses pharyngeal gill slits, dorsal nerve cord and heart.

 Hope this information will clear your doubts about the Hemichordates.
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