“What I find amazing is photosynthesis only evolved one time.”
as best as i can tell, EVERYTHING evolved only one time. Seems unlikely that none of the branches of the “tree of life” ever evolved again given that the singular driving force of the doctrinaire theory of evolution is that we exist inside a temporary, picoscopic pocket of negative entropy ...
I tend to focus on the important ones. Such as the development of the eukaryote which many now believe was the the result of endosymbiosis. The mitochondria used to be bacteria, and that only developed one time. The chloroplast also used to be a bacteria, but it was captured twice. The first led to the development of plants. The other was the capture by an amoeba which had no impact at all.
Regardless, it’s all extremely rare.
Your misplaced mention of entropy doesn’t interest me at all.