AP BIOLOGY

Detailed explanation-1: -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-2: -What are Echinoderms? Echinoderms are the group of animals that consists of sea stars, sea urchins, sea cucumbers, brittle stars and crinoids. They are part of the larger group of animals called INVERTEBRATES.

Detailed explanation-3: -Sea cucumbers are part of a larger animal group called echinoderms, which also contains starfish and sea urchins.

Detailed explanation-4: -Sea lilies and feather stars are examples of Crinoidea. Both of these species are suspension feeders.

Detailed explanation-5: -sea star, also called starfish, any marine invertebrate of the class Asteroidea (phylum Echinodermata) having rays, or arms, surrounding an indistinct central disk.