One of the Trees Studied (image) University of Arizona Caption What looks like a Christmas tree is actually a study subject: Bentley's team, including several UA undergraduate students, carefully attached labels to every single branch of several trees to keep track of them. Credit Photo courtesy of Lisa Patrick Bentley Usage Restrictions This visual may only be used in conjunction with reporting/posting of this news release. Image/video credit must be included exactly as indicated. 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.