When Patton Oswalt lets loose on Twitter (letâs skip the loaded troll descriptor for now), he really digs in and this time he exposed previously unknown depths of reaching when he somehow elicited Breitbart editor Ben Shapiro to inexplicably whine about anti-semitism and generally lose his mind.
Digestive System. Echinoderms have a simple digestive system with a mouth, stomachs, intestineand anus. In many, the mouth is on the underside and the anus on the top surface of the animal. Sea stars can push their stomachs outside of their body and insert it into its prey allowint them to digest the food externally.
Excretory System. The excretory system is in charge of getting rid of bodily wastes and excess water. Jobs of the excretory system: Maintain volume of extracellular (outside the cells) fluid. Maintain ionic balance in extracellular fluid. Maintain pH and osmotic concentration of the extracellular fluid. Excrete toxic by-products such as urea, ammonia, and uric acid.