Betül Kaçar (IMAGE) University of Arizona Caption Rewinding the tape of evolution: Betül Kaçar's group explores the evolution of reconstructed ancient proteins and why life on Earth chose the chemical elements it did. Credit University of Arizona Usage Restrictions This visual may only be used for the purpose of posting and/or reporting of this news release. Credit information must be provided as indicated. 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.