<I>Volvox carteri</I> Micrograph (IMAGE) DOE/Joint Genome Institute Caption This photomicrograph shows an adult, asexual Volvox carteri consisting of ~2,000 small cells (each with two flagella) at its surface and ~16 juveniles in the interior. Each juvenile contains ~2,000 tiny somatic cells at the surface, and ~16 large reproductive cells inside. Up to 99 percent of the volume of an adult Volvox spheroid is Extracellular Matrix. Credit Armin Hallmann, University of Bielefield (Germany) Usage Restrictions Apply image credit and caption as listed when used 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.