Fuck. Good question. Food for thought. Without the moon, stars & sun, there was no "time" reference as we see it today. Meaning that on the 1ST, 2ND, 3Rd, 4Th 5TH, 6TH or 7TH day, of "Creation", there very well could have been millions of years in between the "On the 1ST day", to the 7TH day. The first day; light, then it went from there. My belief is that evolution began & has not stopped since.
Plants in veg state grow twice as fast if given 24/7 lighting. Once we had indoor lighting, out average height grew from average 5' 7" to 5' 11".
Each living being has either offense or defense, and all in between, to survive. The frog, for instance,, has no offensive moves, so it evolved into a defensive creature. Webbed feet, camouflaged , etc. The horse, grew longer legs. The Hippo, not too swift, grew the long self-defensive horn. Animals ate certain plants. The plants either grew taller due to the threat, or made a self- defense system, thorns Etc. Giraffes suffered, grew longer necks to survive. Buffalo's could run, so horns was not that big. Spanish Bulls could not run as fast, so grew longer horns- (The Texas Longhorns)
I don't have a clue.