Question

A specimen of a fish was given to students to identify the externally visible chordate feature in it. The students would look for:
(1) Operculum
(2) Notochord
(3) Dorsal tubular nerve cord
(4) Post anal tail

Answer 1

Answer:

4 it's a answer I hope it will help u

Answer 2

(4) Post anal tail

Explanation:

Chordates are animal of the phylum Chordata. The five anatomical features of this phylum, which is visible at some period of their life cycle, are notochord, dorsal nerve cord, pharyngeal slits, endostyle and post-anal tail. So when a fish is handed over to students, the would have to look for any external feature of the fish that would match one of the five features above. They will have to look for the post-anal tail which is a feature they will find in both the fish and the chordates.