ID theorists have long urged that the case for design is both a positive and scientific argument, based on standard principles of abductive scientific reasoning. Key to the detectability of design are particular characteristics that intelligent agents often leave behind as hallmarks of their activity. We know that intelligent causes are the only category of explanation with the ability to visualize, and ultimately actualize, a complex and functionally specified end goal. Hence, presented with a complex and functionally integrated system in nature, we can infer that some measure of conscious or rational deliberation was employed in its development.
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