Image: Joseph Fielding Smith

From the 1954 publication of Doctrines of Salvation by Joseph Fielding Smith (President of the Quorum of the 12 at the time):[footnote]Doctrines of Salvation Volume 1, pg 89 – Joseph Fielding Smith[/footnote]

Again I repeat, no man can consistently accept the doctrine of the evolutionist and also believe in the divine mission of our Redeemer. The two thoughts are in absolute conflict. You cannot harmonize them and serve both masters.

IF EVOLUTION IS TRUE, THE CHURCH IS FALSE.

If life began on the earth, as advocated by Darwin, Huxley, Haeckel (who has been caught openhanded perpetrating a fraud), and others of this school, whether by chance or by some designing hand, then the doctrines of the Church are false. Then there was no Garden of Eden, no Adam and Eve, and no fall. If there was no fall; if death did not come into the world as the scriptures declared that it did — and to be consistent, if you are an evolutionist, this view you must assume — then there was no need for a redemption, and Jesus Christ is not the Son of God, and he did not die for the transgression of Adam, nor for the sins of the world. Then there has been no resurrection from the dead! Consistently, logically, there is no other view, no alternative that can be taken. Now, my brethren and sisters, are you prepared to take this view?

Crash Course:

Doctrines of Salvation Volume 1
The Origin of Man – Improvement Era, 1909
Quotes on Evolution – Mormon Think
Mormon Views on Evolution – Wikipedia