Assertion: sea urchin's skeleton | /r/Synonym | test
Facets:
Source sentences:
text: Sea urchin spines protrude from tiny pores in the sea urchin’s skeleton, which is called a test.
text: They do, however, have an internal skeleton known as a test.
text: Sea urchins have an internal skeleton (called the test) formed out of large ossicles fused together in plates.
text: The skeleton of a sea urchin is referred to as its test.
text: Sand dollars, like all members of the order Clypeasteroida, possess a rigid skeleton called a test.