Intrusions graphic (IMAGE) Brown University Caption Researchers sampled biological communities and found that intrusions contribute substantially to carbon export. Credit Photo by Kara Perilli, WHOI Creative Studio Usage Restrictions Credit must be given to the creator. License CC BY 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.