The cat varieties today have developed by natural and artificial selection action on the original variability in the information (genes) of the original cats, resulting in differing combinations of information, and thus, speciation. Therefore, only a few "cat" pairs may have been needed on Noah's ark.This "speciation" is NOT "evolution", since it is based strictly on the created information already present, and is thus limited. Evolution from amoeba to man, however, requires new information to arise, and by natural processes. Put another way: one involves thinning of gene pools (natural selection/speciation), the other an expansion (evolution). Thus, for dinosaurs (or any other creature) to evolve, there would have to be a mechanism to produce information from disorder by chance (this has NEVER been observed to happen), and continually add in new information so new types could evolve.But true science has only observed that it takes information to produce information - information NEVER arises by chance. Thus, the evolution (in the Darwinian sense) of dinosaurs is impossible. The Great Dinosaur Mystery Solved!