GENERAL HISTOLOGY

Detailed explanation-1: -Echinoderms have a spiny endoskeleton. They have radial symmetry as adults but bilateral symmetry as larvae. Echinoderms have a unique water vascular system with tube feet.

Detailed explanation-2: -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: -Echinoderms do not exhibit radial symmetry as larvae. Hexagonal and triangular shapes are not examples of body symmetry.

Detailed explanation-4: -Echinoderms are a phylum exclusively consisting of marine animals. The adults are recognizable by their radial symmetry whereas their larvae are bilaterally symmetrical.

Detailed explanation-5: -Adults are distinguished by their radial symmetry, which is shared by starfish, sea urchins, sand dollars, and sea cucumbers. They have five bodies, which they call tube feet. The larvae of echinoderms, on the other hand, have bilateral symmetry.