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.
The excretory system is a system of organs that work together to rid the body of any waste. The excretory systems includes the lungs, ureter, urethra, liver, urinary bladder, kidneys and skin. The excretory system controls the volume of extracellular fluid and also maintains ionic balance in the fluid.