After the mass extinction at the end of the Mesozoic Era,marine invertebrates diversified.

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The mass extinction at the end of the Mesozoic Era wiped out the dinosaurs and many other species, but it also provided an opportunity for surviving marine invertebrates to diversify and occupy newly available ecological niches. As a result, marine invertebrates underwent a rapid radiation during the Early Cenozoic Era, leading to the development of numerous new species and groups.

After the Mass Extinction at the End of the Mesozoic