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by Andres, on June 11 2008:
Biological evolution, while slow, has been working at this problem of efficient bodies for hundreds of millions of years. While the process has been horribly slow and with many mistakes and short-comings, the end result thus far seems to be pretty efficient, hence the modern fish is a good model to build upon.
It makes sense for science to build upon the good things brute-force natural evolution has come up with, even if later technological, scientific innovation evolves a much better design.