Zain, merely that there are marks on human bones that match sabre tooth tigre's teeth is
not conclusive.
Nothing is. Perhaps God put them there. Perhaps aliens did. Perhaps the mammoth chewed the human's leg off.
Commet theory: sort of. There's a lot of iridium in a layer of dust that is extremely unusual unless a comet has hit. And I believe that there is evidence of a meteor strike in Canada (I think). After that it's conjecture.
But there have been many extinctions as shown in the fossil record. True, the sudden end of the dinosaurs is the most popular, but one of the earlier ones wiped out 90% of life on the planet.
Concerning Noah, I admit that once God enters the equation why not grab the water and then dump it. I'd say that it seems a great hastle when he could just kill the troublemakers. Oh, and a very similar story appears in other religious texts that predate the Bible.
What animals look like is their
phenotype
Animals genetic code is their
genotype
Rabbits and hairs look alike, but are not genetically similar (so, same phenotype, different genotype)
A poodle and a rottweiler may look very different, but have very similar genes.
Crocodiles and
some dinosaurs look alike. Dinosaurs varied a lot. Some even had wings, and it is thought are the ancestors of modern birds.

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