Your heart beat causes time to dilate and contract because it feeds your brain and sensory organs.

They actually tested this, a famous photographer Francois Bernell, searched the world to find "twins". These twins were people unrelated, but looked identical. They followed up the art project with a research experiment to look into their DNA and found that they actually did share more genetic material than the average person.

"Dr. Esteller found that the 16 pairs who were “true” look-alikes shared significantly more of their genes than the other 16 pairs that the software deemed less similar. “These people really look alike because they share important parts of the genome, or the DNA sequence,”

https://www.nytimes.com/2022/08/23/science/doppelgangers-twins-dna.html

Not to mention the proteins have different forms in different chemical solutions. So pH, temperature and catalysts can all modify the proteins in different ways. Not to mention proteins can inherently interact with RNA allowing for complex bio machinery basically attached to written code.

We have a lot of this data, good questions, but I've read a lot of data on this, and it's much less ambiguous. Just wish someone would have cited it...

Yeah you'd have to consider optimal fertility cycles and mating/seasonal habits and tendencies. I remember looking at a birth rate chart for the months and we had a very cyclic pattern going, where there would be heavy births after colder months and an obvious 9 month barrier, that would decrease fertility, but obviously this was just the most common, we have pretty crazy reproductive options compared to some of the larger more social and intelligent mammals. Probably because we domesticated, which throws in a whole new set of pressures on birth cycles.

I wonder if it ties into the neanderthal progesterone gene women got.

"Almost one in three women with European descent inherited a genetic variant of the progesterone receptor called V660L from Neanderthals. According to a new study, its carriers have higher fertility, more siblings, fewer miscarriages, and less bleeding during early pregnancy"

Have they studied the flora and fauna or is it too hard?

The colors actually aid in frost and UV protection. In the north as winter comes Carotenoids and anthocyanins will be produced at a higher rate, while reverse biosynthesis occurs revealing the deeper, reds, oranges, blues and purples. At least in cannabis, I can usually play with the final colors, by tweaking temps and also the pH on my feetigation, this can also change the sap and pistil color.