Give scientific reasons.
Balanoglossus is connecting link between non-chordates & chordates.
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[Textbook Question No.6d Pg no. 75]
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Solution
Balanoglossus is a type of worm living in marine habitat.
It belongs to order Enteropneusta.
Balanoglossus is regarded as a connecting link between chordates and non-chordates as it shows presence of notochord, gill-slits and the dorsal tubular nerve cord which are the characteristic features of chordates.
Its body is divided in three divisions known as proboscis, collar and trunk which is one of the characteristic features of non-chordates.