Question

Which chodrate is not a vertebrate
1) catta
2) hippicampus
3) hemidactyis
4) amphioxus

Answer 1

Option 4) Amphioxus is not a vertebrate

It belongs to subphylum cephalochordata.

Answer 2

Amphioxus is not vertebrate. It belongs to subphylum Cephalochordata and phylum Chordata.

It is not Vertebrate because it lacks vertebral column and posses notochord which extends from head to tail region.

In the case of Vertebrate, notochord is replaced by vertebral column.

Hope the answer will be helpful.
Good question.