This is a very interesting point. A very sound argument can be made that NOTHING would or could exist, if an "infinite regress" of contingencies or conditions was a possibility. Lets take a cat for example.First, if the cat is dependent upon a finite number of conditions, then that means there is going to be a most fundamental condition (a last or terminating condition) in the series of conditions that the cat depends upon for its existence. For example, the cat is dependent upon the existence of its cells, which in turn are dependent upon amino acids and proteins, the amino acids and proteins depend on the existence of molecules, the molecules depend upon atoms, the atoms depend upon protons, the protons depend upon quarks, and so forth. With such a series, the quark (or something more fundamental) would be the terminating condition that the cat depends upon for its existence. Now, if the series regresses infinitely to more and more fundamental conditions that have the same existential status as the previous conditions, then the search for the fulfillment of conditions would go on endlessly. But if the search for the fulfillment of conditions would go on endlessly, then every hypothetical conditioned reality in the series would never have its conditions fulfilled and thus would never come into existence.
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