Second of all, any system such as the first circulatory system has to be complete with the pipelines to every location, the heart fully developed and so-forth. I have brought all this up in great detail in the past and the lame answer comes back that this all developed at the same time. Even if that were possible (which it isn't) you have the catch 22 problem. The complete system would have taken eons of time to develop. How could life be possible during this time?
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.