"Just So" Stories of Evolution
There is a common sense saying in science that when anything can serve as an explanation to support a theory, the theory is not scientific.
Let's say that you have a friend who has a theory that invisible pink elephants fly over his house every day at noon. He wants to prove his theory to you. So you agree to be at his house at noon to see his evidence. It's noon and you are staring at the sky, seeing nothing but a nice, clear blue sky – the very sight you have expected and hoped to see. At one minute past noon, he asks you, "Well, did you see them?" You answer "no", and he responds, "That proves it. I told you they were invisible."
When science discovered that the human brain is divided into specialized left and right halves, evolutionists said this specialization shows why humans have evolved further than the animals and can do so many things. Evolutionists said the left side of the brain became specialized so that humans could specialize in speech while also specializing in emotion with the right side of the brain. Then scientists discovered that many animals also have this left and right brain specialization. All of a sudden, the fact of left and right brain specialization among so many creatures was used by evolutionists as evidence of our supposed relationship with animals.
Evolution is a "just so" story where anything can serve as "proof". But when anything can be proof, then nothing is proven.