Assertion: ischium's spine | /r/MadeOf | 33 separate bones
Facets:
value: before birth
type: TEMPORAL
Source sentences:
text: Before birth, the spine consists of 33 separate bones called vertebrae , but 9 of these eventually fuse to form the two composite bones, the sacrum and the coccyx , that construct the inferior portion of the vertebral column.
text: Before birth, the spine consists of 33 separate bones called , but 9 of these eventually fuse to form the two composite bones, the and the , that construct the inferior portion of the vertebral column.