GENERAL HISTOLOGY

Detailed explanation-1: -The only animal in this list that does not belong to the echinoderm phylum is B) sea squirt.

Detailed explanation-2: -Examples of echinoderms include sea stars, sea urchins, sea cucumbers, brittle stars, and feather stars (Fig. 3.83). Although they may appear very different, echinoderms all have two major defining characteristics that set them apart from all other animals: a water vascular system and five-sided radial symmetry.

Detailed explanation-3: -So, the correct answer is ‘Ascaris’.

Detailed explanation-4: -sea squirt, also called ascidian, any member of the invertebrate class Ascidiacea (subphylum Urochordata, also called Tunicata), marine animals with some primitive vertebrate features.

Detailed explanation-5: -Complete answer: Option A Sea urchin: Sea urchins are generally spiny, spherical, echinoderms of the class Echinoidea. Sea urchins move slowly, crawling on tubular legs and sometimes pushing each other with their spines. Sea urchins do not belong to the class Crinoidea.