Lansing, Mich. ? The State Board of Education Tuesday approved public school curriculum guidelines that support teaching evolution in science classes. But the teaching of intelligent design should be left for other classes in Michigan schools, according to the guidelines unanimously adopted by the board.

Proponents of intelligent design say that living organisms are so complex they must have been created by a higher force rather than evolving from more primitive forms.

Tuesday’s board action in Lansing removed some language in the guidelines that was ambiguous and that some board members said could lead others to interpret that evolution is unscientific theory.