What are echinoderms?
Echinoderms are comprised of mainly marine animals. They are found, easily, at any ocean depth. It is the second largest phylum (7000 species) second only to Chordata. Adult echinoderms often sport 5 point radial symmetry throughout their body. One unique trait about this phylum is that most echinoderms possess the ability to regenerate organs, tissues, and even entire limbs! They are also bilaterally symmetrical organisms, meaning that they are made up up mirror halves as larvae. Echinodermata is a phylum that incorporates some of the most beautiful marine life we know of today.
comparisons among animals
All of the animals that I have selected use their systems for their own individual needs for survival. Out of those needs, they all use their muscles for one shared purpose. This purpose is movement, which is achieved by wiggling along with their tubes or stomach. Differing uses would be food gathering. Starfish use muscles to allow food into their body. Sea urchins require the use of plates, along with muscles, to gather food into their mouth. Sea cucumbers require no muscles to gather food, simply tentacles that glide food into their mouths.