Life and Fine-tuning of the universe.

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But I have read arguments to the effect that if some very low level values were not the values they are (planck length?) then the universe as a space that could support matter point blank would not exist.

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Isn't this similar to natural selection? Couldn't we look at an incorrect Planck length as a lethal mutation?

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What exactly do you mean by a sample of one? Do you mean all the different kind life on this planet counts as one? Or do you mean that all the life on this planet has only one similar chemical structure?

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This is just pure speculation, but what if we found life on Europa, one of the moons of Jupiter? It has been theorized that large quantities of liquid water exist on Europa, so it is possible that life is present. This would mean that Ross was wrong in looking for an Earth like planet. He would also have to add in the probability of a satelite in a Jovian system that was heated by internal friction caused by tidal stresses. Simply, why did he decide to stick with just Earth like planets?Secondly, what if life on Europa is not based on DNA? Then any calculations on life forming have to be readjusted to account for different types of genetic systems. Ross is using a limited data set (ie Earth) to extrapolate out into the unknown. It is foolhardy to say the least.

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The "fine tuning" of the universe is not primarily concerned with the possibility of different kinds of life, it is concerned with the factors that go into making the kind of life we know on earth possible.

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This is like saying you have to fine tune water so it fits perfectly in the lake. Life conforms to the environment just like water conforms to the container it is in.