Question

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Answer 1

Excellent Question!!!

Answer :

(1) A is a Balanoglossus and D is a Nereis.

(2) A belongs to protochordata ,

B belongs to Platyhelminthes ,

C belongs to Annelida ,

D belongs to Annelida .

(3) A(i.e. balanoglossus ) has a notochord .

(4) The term diploblastic means animal with two germ layer ,that is ectoderm and endoderm . Example : Coelenterata e.t.c

In the given figure no one is diplomatic.