Hooking up different parts different ways gives you different critters. Maybe one of them is an intergalactic cruiser.
We have only started on figuring it all out.
Except the Designer seems to have modified everything in completely inconsequential ways in every species, and the inconsequential differences are less in species that we expect to be more closely related according to the theory of evolution (yes, it has predictive powers). A deficiency of an enzyme in one species can be corrected by introducing an enzyme with a slightly different amino acid sequence produced by an entirely different species. The function is the same. The theory of evolution would predict such inconsequential differences, ID or creationism would not.