he can't tell me definitively why the eyeball or anything else exists.
To be fair to Crash he would say that there is no reason why. What survived and is..is just what survived and is.
I do wonder about ToE myself. Like how carnivores managed to evolve. Presumably the first mutation which invoked the notion: "eat another live animal" would have resulted in the animal eating its own young. This given that it would be a lot easier than chasing your dinner around. And one would have no need to have evolved protecting ones young against being eaten alive without there being carnivores around.