Assertion: barnacle | /r/HasProperty | shellfish
Facets:
value: because of enclosing shells
type: CAUSE
value: until 1830
type: TEMPORAL
value: because of their sedentary life
type: CAUSE
Source sentences:
text: Because of their sedentary life and enclosing shells, barnacles were thought to be shellfish until 1830, when Charles Darwin began to study them.