Gas exchange (IMAGE) DOE/Oak Ridge National Laboratory Caption Measuring gas exchange over a dead mangrove (left) and a live one (right). Credit Ben Sulman/ORNL, U.S. Dept. of Energy Usage Restrictions Use photo credit License Original 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.