Assertion: nervous system | /r/HasProperty | difficult
Facets:
value: to simplify its study
type: PURPOSE
value: because of its complexity
type: CAUSE
value: to consider all of its parts
type: PURPOSE
Source sentences:
text: We only have one nervous system, but, because of its complexity, it is difficult to consider all of its parts at the same time; so, to simplify its study, we divide it in terms of its structures (structural classification) or in terms of its activities (functional classification).