The test (endoskeleton) of a variable sea urchin (Lytechinus variegatus) washed up on a beach in the Lake Worth Lagoon Estuary. Sea urchins capture atmospheric carbon dioxide and convert it into harmless calcium carbonate to make their lovely symmetrical "shells" (called "test").
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{{Information |Description=The test (endoskeleton) of a variable sea urchin (''Lytechinus variegatus'') washed up on a beach in the Lake Worth Lagoon Estuary. Sea urchins capture atmospheric carbon dioxide and convert it into harmless calcium carbo...
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