That is metaphysics baby! (in my best Dennis Miller impression)
Yes, entropy is what is responsible for the organization of the body eventually breaking down; but it is not in any way to imply that this is within a CLOSED system. Most things die and are eventually or immediately eaten by something. That something that eats them breaks down the preys structures to derive energy to build up their own.
Thus livings systems accelerate entropy, creating disorder to create and maintain its own order.
What we know of physical reality is both necessary and sufficient to explain biological function. There is not a single observed biological function that requires anything “over and above” physical law.
Okay. Then describe for me how physical law accounts for "function."