The best current explanation of why life developed from non-life, is that the chemical and energetic environment was suitable for the reactions that produced the first chemical replicators, and the development that eventually resulted in them becoming sufficiently complex to satisfy the criteria for living things. What we don't know is precisely how this occurred - though there are a variety hypothesized scenarios."Design" is involved when there is no clear reason "why" something occurred.
No one has explained "why" life would develop from non-life, so this implies design.
I find the insistence on intelligent design being necessarily characterised by complexity a little odd, considering that the human designs that are generally considered the best are characterised by their simplicity...
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