Notice in the story below----what is called evolution isn't evolution as people think...RATHER you see built in genetic variation to start with that is LOST over time. ...And God created great whales, and every living creature that moveth, which the waters brought forth abundantly, after their kind, ...and God saw that it was good. Genesis 1:21 [key words are "was good"....something went wrong..sin...]...the "was" included a full plethora of genetic variation/diversity.
"For the vast majority of body parts, there is a trend in evolutionary
biology: “Use it or lose it.”
Many cave-dwelling fish, for example, have
independently developed blindness
over the course of generations, suggesting that it was an advantage to
not waste valuable energy on a useless organ.