Assertion: snail's shell | /r/ObjectUse | used for respiration
Facets:
Source sentences:
text: In abalones there are holes in the shell used for respiration and the release of egg and sperm, in the nautilus a string of tissue called the siphuncle goes through all the chambers, and the eight plates that make up the shell of chitons are penetrated with living tissue with nerves and sensory structures.