Two major studies seem to be rewriting the rules of evolution.
According to new research on the evolution of the human hip bone, the process of change from the simple hips of a fish to the complex, weight-bearing hips of homo sapiens was far less complicated than previously thought. This study, along with those comparing genetic distances between human and other species, underscores just how closely related all living creatures are to one another.
Four-legged animals, or tetrapods, ventured onto land for the first time about 395 million years ago. One important evolutionary change that made this possible was the development of strong hipbones connected by an ilium. The ilium is the largest, most uppermost bone of the pelvic and is present in birds, mammals, and all reptiles except snakes–but not in fish.