Question

Which one is the link between chordate and non chordate?

Answer 1

tadpole larva? I'm not sure

Answer 2

Balanoglossus is a connecting link between chordate and non chordate.

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Balanoglossus shows some characters of non-chordates. It also has notochord as in case of chordates. Since it shares the characters of non-chordates and chordates ,from the view point of evolution , it is called connecting link between them.