Phylum: Echinodermata {Ans: All echinoderms are marine animals Have a calcium containing endoskeleton, containing either plates or tiny, scattered bony elements Use a water vascular system for movement}Kidney {Ans: Primary organ that regulates volume and composition of body fluid}Ligament {Ans: Collagen arranged in sheets (Connects Bones)}Catch collagen {Ans: Unique connective tissue of echinoderms, changes rapidly from solid to liquid state in response to stimulation from the nervous system}Key innovation {Ans: Development in using resources to provide the greatest amount of payout}Alimentary system {Ans: System involved in the acquisition of nutrients from food}