Assertion: sea urchin's test | /r/HasProperty | rigid
Facets:
Source sentences:
text: The test is rigid, and divides into five ambulacral grooves separated by five interambulacral areas.
text: The test is rigid, and divides into five ambulacral grooves separated by five interambulacral areas.
text: The brittle, limy test is rigid and divided into five ambulacral areas separated by five inter-ambulacral areas.
text: The test is rigid and there is a reduced amount of soft tissue in the body wall as compared to other species in the family Diadematidae.
text: The test is rigid, and divides into five ambulacral grooves separated by five interambulacral areas.