Assertion: earthworm's skin | /r/HasProperty | thick
Facets:
value: to
type: PURPOSE
value: as females without young
type: OTHER
Source sentences:
text: A study published in Nature in 2006 found that brooding females in this species have skin that is up to twice as thick as females without young, and that the skin cells themselves may change in quality to offer the little ones more protein and fat.