Thanks hemigreg for trying. Sorry about Forest for the Trees. I maybe kind of get what you’re saying.
We can draw a line from within a gnats hair from the beginning, through the supernovae that created every element, to the space dust that coalesced into the Solar system, and right on down the line to us. At no point on that entire 13.7 billion year time line can you say, "Here life began." Let alone, "Here human life began." Its all one long unbroken continuum.
Them’s just the facts. Which means "we" have been around not hundreds or thousands or even millions of years but billions. The exact same neuro-transmitters that work in lobsters work the same in us. We’re talking older than trees here. You flip back through your family album, all the way to your great great great (a million "greats" later) grandfather and guess what? Its a lobster! Yeah I’m kidding but to make a serious point: we’ve been around evolving and adapting to conditions here on Earth for so long now who is to say suddenly in the blink of an eye that we know for sure just what all those conditions are? Or how we have adapted?
Day and night, sun and moon, hot and cold, are pretty obvious. Electromagnetic fields, frequencies and cycles, who is so sure that just because they are less obvious that they don’t matter?