Assertion: vertebral column's vertebra | /r/HasProperty | process
Facets:
Source sentences:
text: It is formed by the fusion of five sacral vertebrae, a process that does not begin until after the age of 20.
text: It is formed by the fusion of five sacral vertebrae, a process that does not begin until after the age of 20.
text: It is formed by the fusion of five sacral vertebrae, a process that does not begin until after the age of 20.