Question

Balanoglossus is connecting link between non-chordates and chordates

Answer 1

because balanoglossus shows the characters of both the groups (non chordates and chordates).

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Answer 2

According to evolution, connecting link of an organism define as the living organisms which shows the character of two different group of organisms.

Balanoglossus is a connecting link between non-chordates and chordates. They have few chordates character such as it possesses notochord in the upper part of the body and few non-chordates character such as their shape which is similar to annelida.