Questions and Answers：Give a brief answer to each of the following questions in English.What are the factors that gave rise to American naturalism?
THE IMPACT OF DARWIN'S EVOLUTIONARY THEORY ON THE AMERICAN THOUGHT AND THE INFLUENCE OF THE 19TH CENTURY FRENCH LITERATURE ON THE AMERICAN MEN OF LETTERS GAVE RISE TO YET ANOTHER SCHOOL OF REALISM: AMERICAN NATURALISM. DARWIN, IN HIS THE ORIGIN OF SPECIES (1859) AND DESCENT OF MAN (1871), HYPOTHESIZED THAT OVER THE MILLENNIA MAN HAD EVOLVED FROM LOWER FORMS OF LIFE. THE AMERICAN NATURALISTS ACCEPTED THE MORE NEGATIVE IMPLICATIONS OF THIS THEORY AND USED IT TO ACCOUNT FOR THE BEHAVIOR OF THOSE CHARACTERS IN LITERARY WORKS WHO WERE CONCEIVED AS MORE OR LESS COMPLEX COMBINATIONS OF INHERITED ATTRIBUTES, THEIR HABITS CONDITIONED BY SOCIAL AND ECONOMIC FORCES.
