Alkanes, from the possible breakdown of fatty-acids, in distant past..
To me, the question then becomes .. is there any nonbiological-method for Mars to have produced those molecules?
IF so, THEN .. probably that's how they got there..
but without knowing the answer to that question..
it isn't decided, is it?
https://www.amazon.com/Seven-Kinds-Smart-Identifying-Intelligences/dp/0452281377/
identified many years ago that our definition of "intelligence" is far-too-narrow, & anybody who's read it, can understand why I say the evidence is thiat the orginal definition of "intelligence" was intended to lock-out all kinds of intelligence that male academics were not good at..
( 1 example, right from that book, is .. it usually is possible to find 1 girl in a grade-school-class who can identify who's friends with whom, who's enemies with whom, and why, having all that stuff mapped-out in her head..
I'm autistic.
I can't even manage to be anybody's present-friend, more than a few minutes per year?
Been a few years since I had friends..
What any such girl is demonstrating absolutely is an intelligence!
Denigrated by male "authorities", of course, as is to be expected..
Gender-prejudice taints all our world, doesn't it?
Lipman's "That's what SHE said!" backs this..
https://www.amazon.com/Thats-What-She-Said-Together-ebook/dp/B0716GZT1P/ )
( obviously, these aren't "affiliate" links )
Another item, though, music isn't an intelligence, it is a whole set of intelligences:
& I rather suspect that ALL intelligences are fractal, like that..
Nick Lane's Royal Institution Talk, on yt, also indicates that the "atom" of awareness may be mitochondria ( since jamming them jams our awareness, as the anaesthetic xenon, iirc, demonstrates )
https://nick-lane.net/media/how-the-krebs-cycle-powers-life-and-death/
Gottman published, many years ago, that contempt is the primary not-survivable factor in a relationship.
So, this is "rediscovering the wheel", then..
I'd read, years ago, in the science news-headlines sites, that someone had cracked Colony Collapse Disorder:
They'd said that in ALL the hives which didn't have CCD, there was never the coincidence of both a specific virus and a specific fungus, infecting them.
They'd said that in all the hives which did have CCD, both that specific virus & that specific fungus were in-play.
Apparently, to them, the infection of both of those specific-pathogens, meant that their immune-systems were defeated, & everything else got them, then.
Since I can't find that article, here's a different article which identifies some specific pathogen, which I hope includes both the specific-virus & specific-fungus that the other researchers had found to be the culprit:
https://beeprofessor.com/colony-collapse-disorder/