Pinworms have smooth bodies, bilateral symmetry, and complete digestive tracts. What type of animal are they? cnidarians flatworms annelids nematodes

Pinworms belong to the group of worms called the Nematodes which is the answer. Pinworms are intestinal roundworms living in the intestinal tract of animals and human. There are 4 types of pinworms and one of it is Enterobius vermicularis which then infects the humans.