Assertion: sea urchin's gonad | /r/HasAspect | single duct
Facets:
Source sentences:
text: Each gonad has a single duct rising from the upper pole to open at a gonopore lying in one of the genital plates surrounding the anus.
text: Each gonad has a single duct rising from the upper pole to open at a gonopore lying in one of the genital plates surrounding the anus.
text: Each gonad has a single duct rising from the upper pole to open at a gonopore lying in one of the genital plates surrounding the anus.