Some populations developed effective methods of defense. One type of bivalve, the Inoceramus, grew a shell up to two meters in size. The emergence of reefs also provided protection from predators. But it was the sea urchin that changed most remarkably at the end of this period. Most sea urchin families that appeared then still exist today. And their way of life has hardly changed.
Canadian Heritage Information Network
Canadian Heritage Information Network, Canadian Museum of Nature, Musée du Séminaire de Sherbrooke, Royal Tyrrell Museum

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