Assertion: mollusk | /r/HasAspect | mantle
Facets:
Source sentences:
text: They also have a mantle that can secrete an internal or external shell.
text: Furthermore, mollusks have mantles that secrete calcareous outer or inner shell while arthropods have an exoskeleton made up chitin.
text: In mollusks that have shells, such as clams, mussels, and snails, the mantle is what secretes calcium carbonate and a matrix to form the mollusk's shell.
text: Although extremely diverse, molluscs have some common characteristics such as a soft, unsegmented body, a muscular foot or tentacles and a mantle that can secrete a shell.