Of course I'm being serious...but I'm not presenting the strawman argument you're saying i'm saying. Did you expect God to put the exact hoof on all the hoofed animals? The tweaking (reuse of similar DNA) wasn't done to make the animals work, finally get it right....but rather to work better for the animal. Perhaps you thought God would use a horse hoof on all the hoofed animals.
What you need to explain is why this tweaking would necessarily produce a nested hierarchy. You need to explain why this tweaking would not result in species with a mixture of bird and mammal features, or a whole host of other combinations of features that would violate a nested hierarchy.
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