How Did Dinosaurs Evolve?

Oxygen helps our muscles so we can move. Dinosaur bones would have helped them get lots of oxygen to help power their big bodies. Big sauropods evolved into super big species like the titanosaurs, because being big worked really well where they lived. If you can turn from cat size to car size in a year, you're more likely to stay safe from larger carnivals. Giganortosaurus is probably the biggest carnivore that's ever walked the earth and eats other dinosaurs.