&gt; <i>You are making a radical suggestion; that scriptures (or their &#x27;source material&#x27;) are the whole truth of how they themselves came to be rather than the end of a long process pre-dated by unknowable oral tradition.</i><p>I have in no way made such a claim.<p>There is a <i>known</i> timeline of human understanding of germs, bacteria, viruses, etc. That knowledge is out there, and the timeline we can build with available records is perfectly knowable, insofar as humans are capable of perfectly knowing anything based on available evidence.<p>That you seem intent on persisting in arguing the plausibility of undocumented and truly unknowable alternative scenarios makes for very boring discussion. Let&#x27;s just say aliens did it. We cannot possibly prove otherwise.