The Scope Trial in 1925 revolved around which controversial idea?

The Scopes trial was a trial in Dayton, Tennessee in 1925, in which teacher John Scopes was accused for his defiant against the prohibition of teaching evolution in school, as the teaching of doctrines contrary to the biblical creation in Tennessee was banned in early 1925. Finally, Scopes was found guilty and fined with $100, but was not sentenced to jail. The Tennessee Supreme Court overturned this verdict in 1927 for a formal error, as it had not been handed down by the jury, as it should have been, but by the president of the court personally.