An international study led by researchers from the University of Tartu shows that approximately 470 million years ago, a significant ecological change took place in the world's oceans: For the first time, the interiors of empty mollusk shells began to be used as habitats. This marked the emergen...

Source: [Phys.org](https://phys.org/news/2026-07-marine-animals-colonized-seashells-million.html)

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