"... Within the Australian lungfish's giant haystack of genes are clues to how animals made the transition from aquatic to terrestrial. [This] required a number of evolutionary innovations including airbreathing, limbs, posture, prevention of desiccation, nitrogen excretion, reproduction, and olfaction ... [Researchers] identified the same genes responsible for our embryonic lung development already present in the lungfish, as are our familiar ulna and radius arm bones, and the genes that encode them."

How does genome expansion, through copies, become an important driving force of evolution, AND help provide organisms with the ability to rapidly adapt to a changing environment?