Assertion: jellyfish's mesoglea | /r/HasProperty | soft
Facets:
value: often
type: DEGREE
Source sentences:
text: The mesoglea of polyps is usually thin and often soft, but that of medusae is usually thick and springy, so that it returns to its original shape after muscles around the edge have contracted to squeeze water out, enabling medusae to swim by a sort of jet propulsion.