Is evolution a fact? | Yahoo Answers

Let me try to clarify what is established beyond reasonable doubt and what needs further study on evolution. Evolution as a process that has always taken place in the history of the Earth can only be questioned by those who ignore the evidence or are resistant to the evidence, due to emotional blocks or simple fanaticism. On the contrary, the mechanisms that bring about evolution certainly need study and clarification. There are no alternatives to evolution as the history that can endure the critical examination. However, we are constantly learning new and important facts about evolutionary mechanisms.

– Theodosius Dobzhansky "Nothing in biology makes sense except in the light of evolution", American Biology Teacher vol. 35 (March 1973) reprinted in Evolution versus Creationism, J. Peter Zetterberg ed., ORYX Press, Phoenix AZ 1983