Explain the influence that On the Origin of Species had upon realist writers.

Charles Darwin's The Origin of the Species has turned literature to 360 degrees. It leads theatre and book writing towards realism - a more realistic approach. It gives realist writers the chance to show what they've got. How operas and books have been played and written respectively would not be the same as of today if not because of the Origin of the Species. It has opened the mind of everyone from illusion to reality.