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Due to poor fossil records, some information regarding the evolution of birds are based on theories but during the last 30 years, the evolutionary relationship between birds and dinosaurs have become more firmly established. Some important evolutions of birds were the evolution of feathers, and avian locomotion (Bird evolution, 1996).
The modern bird has been modified significantly. The body evolved in such a way for it to be fit to fly. For example, the front limbs became wings, and their breastbone was enlarged in order to support flight muscles. They also now have light, hollow bones. A significant modification was the evolution of a four-chambered heart, which also changed their circulatory system allowing them to breathe through their lungs (Birds, 1999)...
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