Which of the following correctly describe a sea urchin?

Select all that apply.

cnidarian

chordate

invertebrate

echinoderm

deuterostome

Sea Urchins are described as Deuterostomes

Option D, Echinoderm

Explanation:

Deuterostome are species which are bilalteral in structure and the first embryonic opening becomes the anus.

There are three classes of deuterostome namely

• Chordata

• Echinodermata

• Hemichordata

The sea urchin belongs to the phylum Echinodermata which have radial symmetry (includes starfish etc.) and have a unique a water-vascular system (hydraulic system) which is used for respiration, locomotion and transportation of food item.

Thus, option D is the correct answer.