Tiny Invaders (IMAGE) Columbia Climate School Caption The millimeter-size organisms can both perform photosynthesis and hunt down other organisms for food. Credit Kali McKee/Lamont-Doherty Earth Observatory Usage Restrictions Credit must be given. 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.