From Darwin until now the big picture of evolutionary theory paints a picture of one species changing into another.
It is an imagined and unobserved process.
“From Darwin until now the big picture of evolutionary theory paints a picture of one species changing into another. It is an imagined and unobserved process.”
I will agree that it has not been observed since it happens over a very long time frame. I prefer to call evolution a theory rather than an “imagined process”. The fact that bacterial populations undergo a simple form of evolution makes the theory plausible.