Cupuladiid Bryozoan (IMAGE) Smithsonian Tropical Research Institute Caption Tiny bryozoans in sediments dredged up from the bottom of the Caribbean Sea reveal that environmental change drove evolution. Credit Aaron O'Dea Usage Restrictions credit: Aaron O'Dea License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.