Curiosity Mars rover discovers largest organic molecules ever seen on Red Planet

We'll just tell your mother that we ate it all.

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?