...Due to the principles of gravity, mass, and the limitations of muscular anatomy in any life form, it would not be possible for any animal weighing more than 20,803 pounds to be able to lift its own weight (Holden, 1994). However, the Brontosaurus is supposed to weigh over 70,000 pounds, and other so-called sauropods are supposed to be many times larger than that. Then there is the issue of neck size - a long necked animal of that size would not even be able to lift its neck. Additionally, their blood pressure would be way too high to be able...