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HOW MANY YEARS AGO DID THE DINOSAURS BECOME EXTINCT?
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- What was more important for the invasion of the land by vertebrates during the Paleozoic: becoming tetrapods, evolving efficient lungs or evolving waterproof skin?Because of selective forces, the dinosaurs were superbly adapted to their environments. After the dinosaurs became extinct, the small mammals that had been relatively unimportant animals in the background flourished and evolved into many new types, including the line that led to human beings. It is unlikely that these new types would have ever evolved had not the dinosaurs disappeared. If the extinction of the dinosaurs was caused by an extraterrestrial impact, did it matter how well they were adapted to their environment? What does this suggest about the starting cause in the evolutionary success of these new types of mammals?At the end of which geological time period did the Starfish become extinct?