Chloroplasts (image) University of California - Berkeley Caption These are chloroplasts visible in the cells of Plagiomnium affine, the many-fruited thyme moss. Photosynthesizing cyanobacteria invaded the earliest one-celled plants about 900 million years ago, conferring on plants the ability to convert sunlight into energy and setting the stage for the diversification of plants. Credit By Kristian Peters through Wikipedia Usage Restrictions Please credit to Wikipedia, http://en.wikipedia.org/wiki/File:Plagiomnium_affine_laminazellen.jpeg. 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.