How come dinosaurs become extinct and many more...........

The last dinosaurs died approximately 65 million years ago. Dinosaur extinction theories have been the subject of much debate and controversy. A recent explanation, supported by many scientists, suggests that a big meteorite crashed into Earth, changing the climatic conditions so dramatically that dinosaurs could not survive, ash and gas spewing from volcanoes suffocated many of the dinosaurs, diseases wiped out entire populations of dinosaurs, food chain imbalances lead to the starvation of the dinosaurs. Now we'll introduce just a few of the popular theories dealing with the extinction of species and evolution of species. Come let's explore evolution– the most exciting era.

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http://www.wonderwhizkids.com/index.php/biology/evolutionary-biology/exploring-life