Naturalism

Man is a product of all the material conditions of life that he encounters on the road from cradle to grave; and the mores, folkways, and religious thinking are but the shadow cast on human behavior by this shifting material basis of the society.

A twentieth-century naturalist constructed the understandable quote above. Naturalists believe that one's heredity and social environment decides one's moral character. They follow the idea that man is only an animal and a product of his genes and his envoronment. Also, they believe in mores, which is defined as the accepted traditional customs and usages of a particular social group, while insisting that as the environment changes, man has to adjust and change according to the environment he or she is in. 
Naturalism abides by the thoughts and theories of evolution, which is the change in the inherited traits of a population from one generation to the next. These traits are the expression of genes are copied and passed on to the offspring during the process of reproduction. Generations and generations of families pass on their knowledge, skills and weaknesses to their offspring, and the child has very little chance, if none, to fix or gain the traits during his or her childhood that he has received. The values and characteristics are simply given to the human offspring, as the generation's traits will have full effect on the outcome of the human offspring's traits. 
Charles Robert Darwin was an English naturalist.He proposed and provided scientific evidence that all species of life have evovled over time from one or a few common ancestors through the process of natural selection. His theory of natural 

selection came to be widely seen as the primary explanation of the process of evolution, supplying naturalists with a common thought and belief.
A man is a product of his environment, and his conditions of life are affected by it. A romantic believes that man rises over the environment