AP BIOLOGY

Detailed explanation-1: -The phylum Echinodermata comprises five extant classes. These are the Echinoidea (sea urchins), Asteroidea (sea stars, commonly called starfish), Holothuroidea (holothurians, commonly called sea cucumbers), Ophiuroidea (brittle stars) and Crinoidea (sea lilies).

Detailed explanation-2: -The ability to regenerate, or regrow, lost or destroyed parts is well developed in echinoderms, especially sea lilies, starfishes, and brittle stars, all of which can regenerate new arms if existing ones are broken off.

Detailed explanation-3: -Our human cells can do a lot of amazing things but the cells of echinoderms take it to a whole other level. Sea stars, brittle stars, and sea cucumbers all have the ability to regrow entire body parts!

Detailed explanation-4: -Starfish, or sea stars, are radially symmetrical, star-shaped organisms of the phylum Echinodermata and the class Asteroidea. Aside from their distinguished shape, starfish are most recognized for their remarkable ability to regenerate, or regrow, arms and, in some cases, entire bodies.

Detailed explanation-5: -As adults, echinoderms can regenerate many organs, including limbs, disc, gut, spines and podia and, in some species, regeneration is used for asexual reproduction2, 3.