Annual (IMAGE) The Hebrew University of Jerusalem Caption Annuals serve as the ecological equivalent of laboratory mice due to their petite stature and rapid generational turnover. Scientists employ them to create "microcosms," which are experimental ecological communities. Credit Niv DeMalach Usage Restrictions none 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.