Anybody can ask dumb-*ssed questions, and there are tons of questions which no scientist can answer with confidence.
Indeed there are questions which have no scientific answer, and just because you've stumbled on some of those, doesn't make you some kind of genius.
What would, would be careful study of the subject, research into all the relevant scientific literature, independent experiments with published results in peer-reviewed articles.
Never fear, much of this is already done, and is reported in the second book of post #33 above.
That would be a place to begin your education.
So what are you saying -- that the riddle of how gigantic sauropod dinosaurs could exist on Earth (as we know it), has been solved with absolute certainty?
That IS the question we're asking here. How 'bout you set the professorial tone aside, and just tell us what you think.