---More difficult questions arise with the "if you change this specific factor, the universe as we know it wouldn't exist" line of reasoning. Modern physics seeks to get around this conundrum with multiverse theories,---
neverendingjourney: good point. life had to start and evolve to fit the conditions here, that came about by the forming of the Solar system, and Jupiter was first, the biggest and the most accurately matched in the "Titius"*** sequence. Slightly different emerging conditions should have produced different life forms.
Having to invent multiverses to lower the odds to have that happen by pure chance, is overkill, if it happened here. perhaps everywhere?
*** James Gregory 16xyz has priority claim to revealing the doubling of planetary orbit radii, now named after Tietze. so:
Without Jupiter's very close match to the Earth orbit in nature, and as seen in comparing them in the Bode sequence, which after all does nothing but classify them, we, as we know us, probably would not be here.