The adaptations for life on land have long puzzled biologists. The question range from are feathers descendents of dinosaur scales, how did arms and legs evolve from fins, and from what ancient fish organ did the lung evolve? Biologists have known that the co-development of the cardiovascular and pulmonary systems is a recent evolutionary adaption to life outside of water, coupling the function of the heart with the gas exchange function of the lung. ...
via Medindia Health News
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Lake forest health and fitness http://healthandfitness1blog.blogspot.com/2013/07/biologists-explain-how-life-adapted-on.html
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