Figure 1. Volvox in its natural form. The multicellular organism is composed of up to 50,000 cells that adhere to each other, forming a sphere. Each colony is composed of two differentiated cell lines: a large number of somatic cells with flagella and a smaller number of germ cells lacking in soma that lie in the interior. Photo by Specious Reasons, available at https://www.flickr.com/photos/28594931@N03/20108157326/.
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