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Species of life have evolved and died out over billions of years, leaving behind fossils in rock layers which demonstrate the gradual development of simple forms of life into more complex forms.

When their estimates agree, their belief in the accuracy of both estimates improves.Thus, they believe that evolution -- whether caused by natural forces, or directed by God -- over 4.5 billion years of earth's history could not have happened.A single observation which proves beyond doubt that the earth has been in existence for less than, say, 1 billion years would greatly weaken the arguments in favor of evolution.The radioisotope methods—long touted as irrefutably dating the earth as countless millions of years old—have repeatedly failed to give reliable and meaningful absolute ages for Grand Canyon rocks.In the walls of the Grand Canyon, we can see that the whole horizontal sedimentary strata sequence was folded without fracturing.There simply would not have been sufficient time for all of the natural geological and biological processes to produce the complexities of the present world.