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I'm not claiming proof. I'm citing evidence. Fact: the basic chemical components of life on earth all shere the same basic chemical building blocks. This must be true if there was only one origin, but does not need to be true for multiple. Therefore the current evidence favors singular. What is your evidence in favor of multiple? How is my argument irrational?
All that would mean is that if you get the chemical reactions known as 'life', it would form from the most common elements that have the best , as well as the ones with the best chemical properties.