Original - The Colonial Flagellate Hypothesis proposes that multicellular organisms evolved from a single flagellated cell. it is believed that a group of these unicellular flagellates combine to form an aggregate then form a sphere which develops specialized cells (such as reproductive cells), and then fold in on themselves to create a tissue layer.
This a high quality diagram which clearly illustrates a leading hypothesis for the mechanism for the evolution of multicellular organism.
These type of images are basically expected to be in SVG format these days, this is PNG. Additionally it would need to be referenced to a reliable source/s on the image page. Article use isn't great - no caption, and wording does not particularly match the section of the article it's in. If those things could all be addressed for starters, we could maybe look again. --jjron (talk) 13:16, 28 May 2012 (UTC)[reply]