Empty seashells became the ocean’s first ready-made homes 470 million years ago

Approximately 470 million years ago, ancient mollusc shells started to serve as habitats for small sea creatures, initiating a profound ecological transformation across global ocean ecosystems. These empty shells offered safe havens and surfaces for tiny marine animals to cling to, with their shapes playing crucial roles in determining the size and variety of these diverse communities, an ancient behavior that laid the groundwork for today's oceanic life.