Assertion: sea urchin's body | /r/MadeOf | tough gelatinous tissue
Facets:
value: with unique properties
type: OTHER
Source sentences:
text: The body of some deep water holothurians, such as Enypniastes eximia, Peniagone leander and Paelopatides confundens, is made of a tough gelatinous tissue with unique properties that makes the animals able to control their own buoyancy, making it possible for them to either live on the ocean floor or to actively swim  or float over it in order to move to new locations, in a manner similar to how the group Torquaratoridae floats through water.