I honestly do not believe that is that case at all. Considering convergeant evolution, the bipedal creature with 4 limbs is the most successful pattern to accomodate everything from farming to technology. No other form has the leverage, dexterity or maneuverability to make an Industrial Revolution happen. Simon Conway Morris, well known Palaeontologist puts forth a very good argument that I think if darn near impossible to refute. A very good example of convergeant evolution is the Tasmanian Tiger. The canine shape was very successful as a hunting model, and it was adapted by this marsupial. The bipedal stance, the opposable thumb and our brain make our pattern one that really ought to show up again in the evolutionary stakes. You would not be the first one to say that life will be unrecognisable, yet I have not seen a good argument why the bipedal shape would not be utilised in evolution extensively for life as we know it. It is a bit arrogant to think of this as "our shape" as it is anything but. We are the product of the which nature provides us - the environment. e are looking at earth like planets to find intelligent life, so why would an earth like planet not have earth like beings following evolution, just as they did here? 50 Billion species have evolved here, and only one shape made it through to intelligence capable of establishing a civilisation, and more than once considering the Neanderthal's, The Denisovians, Flores People, and many more yet to come I am sure.
Harvard University Biologist Ed Wilson agrees with this position.
I agree with Sagan that life can take all forms, but I do not believe all forms are suitably adapted to allow an Industrial Revolution to take place. Intelligent life I feel is likely to be quite familiar.
LINK - Professor Simon Conway Morris Homepage.
LINK - Paper
Edited by psyche101, 15 November 2012 - 03:30 AM.