Assertion: fern's system | /r/CapableOf | pave the way
Facets:
value: for seeds
type: PURPOSE
value: for ovules
type: PURPOSE
Source sentences:
text: This system paved the way for ovules and seeds: taken to the extreme, the megasporangia could bear only a single megaspore tetrad, and to complete the transition to true ovules, three of the megaspores in the original tetrad could be aborted, leaving one megaspore per megasporangium.