Presence of certain type of bacteria in intestinal tract can also affect the color of human stools. Salmonella, a type of bacteria, if enters in human intestine or digestive tract, could disturb its functioning and result in change in color of stools. This could be easily treated with antibiotics.
Many critics have suggested that there is no clear distinction between realism and its related late nineteenth-century movement, naturalism. As Donald Pizer notes in his introduction to The Cambridge Companion to American Realism and Naturalism: Howells to London, the term realism is difficult to define, in part because it is used differently in European contexts than in American literature.
(1881-1973). The reaction in the late 19th century against naturalism in art led to a sequence of different movements in the 20th century. In each of these periods of innovation Pablo Picasso played an important part. He said that to repeat oneself is to go against the constant flight forward of the spirit..