Warden_of_the_Storm
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- Oct 16, 2015
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What is your definition of a dinosaur? Anything that died off prehistorically, and anything that survived is not a dinosaur?
All these "giant lizards" and other large animals that are found in the fossil record would be just another animal with a modern name, had they survived. They were simply too large to survive after the sudden change in barometric pressure and O2 content.
The tortoise's, alligators, rhino's, whatever, survived due to their body size compared to lung capacity.
As for the Blue whale and your question "how do you explain that"? I believe you will agree that the pressure above the water level is quite different than below. Therefore any ocean creature lives in a different pressure. If you look at Boyles gas law of pressure, under pressure the of O2 is equivalently higher. If you are a scuba diver and breath from a scuba cylinder filled with air at atmospheric pressure and dive to deeper depths you run the risk of O2 poisoning if you go very deep. The % O2 will be equivalently higher as the pressure increases. This is why they use air mixers for deep dives.
The same factor is what kept the ocean dwellers alive. The change in pressure above the sea level was quite drastic, however it was a very small change, in fact insignificant to the blue whale. Thus they survived.
That's how I explain it.
Definition of a dinosaur (from dictionary.reference.com):
noun: any chiefly terrestrial, herbivorous or carnivorous reptile of the extinct orders Saurischia and Ornithischia, from the Mesozoic Era, certain species of which are the largest known land animals.
Or, to use a more specific definition: any prehistoric reptile that had it's hind legs straight under it's body instead of splayed out to it's side.
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