Assertion: angiosperm's pollen | /r/MadeOf | single furrow
Facets:
value: through the outer layer
type: LOCATION
Source sentences:
text: The pollen from the first angiosperms was monosulcate, containing a single furrow or pore through the outer layer.
text: The pollen from the first angiosperms was monosulcate, containing a single furrow or pore through the outer layer.