there hasn't been enough time for life to go from single cell organism to humans and humpback whales via random mutations. evolution as it's popularly understood would need more time by an order of magnitude, at least. we know how long it takes for an ecoli strain to change into something unique via a mutation that doesn't result in the death of the cell, and how long it takes for that mutation to become fixed in the population. when you know that, and consider all the mutations that it would take to get from there to here, and look at the age of the earth, the numbers do not add up. now, maybe mutation had some role in all that, but evolution by natural selection can't be it by itself. something else was going on, something we haven't even considered yet.
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