Ans. They are cylindrical, triploblastic, coelomate, or pseudocoelomate animals.
Respiration in these animals takes place through gills, trachea or body surface.
Most days, sexes cannot be distinguished among the members.
Modes of replica involve sexual and fissiparous
Fertilization is external, although internal fertilization may happen in some species.
The body of a non-chordate generally has an open type of cardiovascular system.