re: Evolution: Missing link found. Fish => Tetrapod

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Entropy suggests this absolutely shouldn't be happening - without intervention, forms should go from more complex to more simple due to entropy.

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This is a complete and total misunderstanding of entropy. Yes, entropy is always increasing. Yes, a system will always tend to go from "order" to "disorder". But here's the thing... entropy increases when energy is converted into work. In our system, the sun is the source of all energy. It is constantly releasing energy, which is doing the work of growing and replicating life on earth. There is plenty of energy remaining in the sun, and it will continue to do work as it is released. I don't know where you are getting this "complex to simple" stuff. The sun is very ordered and simple, but the work it does is less predictable (disordered). Order -> disorder. Complexity is the state of being complicated and less ordered. Pure energy is about as simple and ordered as it gets, and nearly any work it does is going to result in something less ordered and more complex. This is the exact process by which entropy increases.

I don't know how people confuse "complexity" with "order". They are antonyms in this context.