Assertion: tissue's amount | /r/HasProperty | necessary
Facets:
Source sentences:
text: The amount of $87 million in FY 2005 and such sums as may be necessary thereafter be appropriated to fund the research
text: When a greater amount of bone is needed, it can be taken from another site (commonly the back of the bottom jaw) and transplanted to the implant site.
text: A moderate amount of UV in sunlight is necessary for the skin to form vitamin D.