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" "Becoming a rock does not ensure safety. ...The blasting of windblown sands, the pummeling of waves, the corrosive secretions of mosses and lichens, and even the steady rhythm of a stream can, in time, reduce a seemingly indestructible boulder to a grain of sand.
Jeffrey Hugh Schwartz (born March 6, 1948) is an American physical anthropologist and professor of biological anthropology at the University of Pittsburgh in Pittsburgh, Pennsylvania, and a fellow and President of the World Academy of Art and Science (WAAS) from 2008 to 2012. Schwartz' research involves the methods, theories, and philosophies in evolutionary biology, including the origins and diversification of primates. He has studied and analyzed human and primate skeletons and archaeological remains, focusing much of his research on dentofacial morphology. He has done substantial fieldwork and museum research in the collections of major museums around the globe.
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As was demonstrated as long ago as the 1930s by the German experimental geneticist Hans Grüneberg, neither structural reduction or loss, nor structural addition, is a completely gradual process. Instead, the loss or gain of a structure is developmentally constrained to be more step-wise, or saltational.