Evolving the Musculoskeletal System

The same way it does it absolutely anything else. Do you mean how does the 2nd law of thermodynamics relate to evolution? In which case: it allows biological organisms to work at all.

No.Entropy doesn't do anything. It's a measure of something.

DNA, separated from the machinery that maintains its integrity in the cell will degrade over time, yes. And the ways in which in does so relate to the second law of thermodynamics but, of course, if the second law didn't operate in the first place DNA would not form or stay together in the first place

I'm with Wounded King, sharks are not descended from teleosts, which is what I'd understand bony fish to mean.

And this is the trouble with Creationists: you don't know your biology.Pick up any decent textbook on the diverse biology and read it. You'll soon discover that there are animals living today that prove your argument completely wrong. There are animals in which the organs are simply suspended in fluid. Animals which have a sort of circulation system with no heart in which the fluid is moved simply by the motions of the animal. Animals with a primitive sort of heart - really nothing more than a bit of muscle that keeps the fluid moving. Animals with the separated lung/body circulation you see in humans, but an undivided heart so that the oxygenated and deoxygenataed bloods mix as it pumps, semi-divided hearts that improve the separation of the two and then hearts like ours which fully divide the two.If you took the time to study even a little bit of biology you'd know how absurd your claims that such things couldn't exist and wouldn't work really are.

No, I'm afraid not. The fish that have bones where the sharks have cartilage are all teleosts, it is generally accepted that elasmobranches (inc. Sharks) did not evolved from the teleost fish.