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Terrestrial Origins and Evolution
oval shell with tapered ends
06/16/11

 

Scanning electron microscopy images reveal a microscopic, oval-shaped shell with tapered ends, from which an organism’s feet may have extended. The surface of the shell is made up of tiny bits of silica, aluminum and potassium, which the organism likely collected from the environment and glued to form armor. Credit: Tanja Bosak



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