Assertion: skeletal system's bone | /r/MadeOf | marrow
Facets:
Source sentences:
text: The human skeleton takes 20 years before it is fully developed, and the bones contain marrow, which produces blood cells.
text: In some bones, the cortical bone surrounds the less-dense trabecular bone and the bone marrow lies within the trabecular bone, but not all bones contain trabecular tissue or marrow.
text: The human skeleton takes 20 years before it is fully developed, and the bones contain marrow, which produces blood cells.