Dredge writes:
Which is the more sensible approach? ... invent a different system for each one of the millions of species of organisms on earth, or use the same system for each one?
The more sensible approach
for a designer with limited means is to copycat. But for a GOD, why would He limit Himself? Why not use His imagination?
Dredge writes:
But on the other hand, humans have a long history of borrowing ideas from nature to build stuff. Would humans have ever thought of flight if they hadn't seen birds doing it?
Maybe you can answer my question about the biological zeppelins. What idea did we borrow from nature there?