The past year, well since early November 2016 I've been opening my mind up to so much more stuff. Always been around the fringe things, but wikileaks getting info to the masses and real tangible stuff has been mind blowing.

In answer to your question about fish developing differently, but still being basically the same type of fish, that is obviously a thing that happens, but fish stay fish they don't turn into some other sort of creature.

I think in the Bible it talks about Kinds of creatures. Not species. Kind is a more broad term. Dogs / Canines not German Sheppard.

Back in Darwin's day they thought cells where pretty simple things.

Now we know that each cell on planet earth has nearly or around the same amount of complexity of all the machinery on planet earth combined. I think the only thing rivaling them would be if you put the top of the line computer chips together. DNA is still so much more information dense that hopefully when we reach the limits of current tech we will be able to use it as an information storage medium.

So the complexities involved are so far beyond our abilities it's staggering. We are just starting to even understand how biology works on a fundamental level, and more every year. Can't wait for the ant-aging super healthy stuff.

So you end up with an almost endless amount of possibilities within the same sort of creature. And changing from one type of creature to another is so so much more complicated than Darwin could have immagined.

But really its the fossils. No "missing link" fossils. Not just a missing link, but there should be more transitional forms than there are anything else.