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Since any theory of evolution eventually boils down to the necessity of abiogenesis, which is impossible, there is only one credible theory left.
Evolution starts with the first life. Evolution describes how life changed, not how life came about. Remember that Darwin wrote "Origin of Species" not "Origin of Life". For all intents and purposes, aliens could have planted the first bacteria on earth from which all life eventually sprang. Also, nothing has ever been discovered that would prevent abiogenesis to begin with, other than fiery sermons from a pulpit.
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To paraphrase Sherlock Holmes, when you eliminate the other possibilities the only one left must be the truth.
Science uses evidence to infer, not to deduce. Holmes' technique is not used in the sciences. In science, all positive claims must be supported by positive evidence, not negative evidence.
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As to evolution being tested in a lab, I'd like to see those results.
It is tested every time two species genomes are compared. It is tested every time a fossil is dated. It is tested every time the characteristics of a fossil are meaured. It is tested every time a new species is found. It is tested every time a new allele is created through mutation. Evolution is tested in an ongoing and continual manner.
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