@jerlands,
jerlands wrote:This is how I arrived at that conclusion... A group of fish get trapped in a dark cave and so to survive their senses have to change.
It starts with variation, which is one of the three key components of Biological Evolution (Reproduction, Variation and Selection are the three key components). Organisms in a population are not genetically identical, there is always variation. All it takes is for selective pressures to favor one group of genetic expressions over another in each reproductive cycle and the population will change over time (evolve).
jerlands wrote: Something like how a blind man's other senses sharpen. But.. the question is how did that change start?
The process of Biological Evolution is absolutely
nothing like how a blind man's other senses sharpen. It is a completely different thing entirely.