Assertion: caecilian's body | /r/CapableOf | occur within the envelope of skin
Facets:
value: by flexures of the entire body
type: MANNER
value: often
type: TEMPORAL
Source sentences:
text: Caecilians move through soil by a process called concertina locomotion, in which the body alternately folds and extends itself along its entire length, often occurring within the envelope of skin as well as by flexures of the entire body.