Assign a group to an organism X which has notochord in some larval forms

cbse
diversityinliving

#1

(i) Assign a group to an organism X which has notochord in some larval forms.
(ii) What would -be the place of occurrence of X.
(iii) What would be symmetry of X?


#2

(i) X-group—Protochordata,
sub-phylum-Urochordata.
(ii) Sea
(iii) Bilateral symmetry