Assertion: snail's mucus | /r/ObjectUse | used as coating
Facets:
Source sentences:
text: The mucus of gastropods is not only used as a coating to cover the surfaces on which the snail crawls and a coating to cover the exposed soft parts of the body, but also sometimes to allow a resting snail to adhere passively to surfaces such as rock, making a temporary sealing structure called the epiphragm.