3c.+Echindoderms


 * ECHINODERMS **

Echinoderms are sexual. They release as many as 2.5 million eggs at one time. They release their eggs into water. There are many types of foods they eat. For example, mollusks, oysters, and clam. They eat them by inserting its stomach into the shell and begin to eat their prey. Some echinoderms include starfish, sea urchins, sea cucumbers and sand dollars. They get oxygen from gills which are thin and oxygen can diffuse in from surrounding water. The way they defend themselves is by showing their prickly skin. They usually have five-part radial symmetry and they have no subphyla, and have a poorly defined circulatory system because they don't move that much. They have a water vascular system which pumps water through the madroporite and have tubed feet to attach to objects.Echindoderms are very simple, but they are not the simplest phyla.They have little calcium plates under thier scales.

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