Resumen de Bone. (Cover story)
The article discusses the evolution of bone. Topics include examples of early life forms that resided in the world's oceans and had exoskeletons such as crustaceans with exoskeletons constructed from chitin and protein mollusks that produced their exoskeletons from calcium carbonate extracted from the water. Topics include how wormlike structures manufactured internal bones, making them the first vertebrates, the evolution of the storage of calcium, and the role of osteoclasts in bone tissue.
