role in the contemplation about the history of dinosaurs. During the event, a large species of animal and plant that existed on earth became extinct. Research indicates that the event took place in over a short duration. Ectodermic species like crocodiles and leatherback turtles managed to survive. Ideally, animals that weighed less than twenty kilos managed to survive during the period. The event ended the Mesozoic period and created the contemporary Cenozoic era. Scientists have come up with various theories that describe the occurrence of the event. Each of the theory is based on the facts and evidence collected over a specified period. They believe that the reason behind the event was an asteroid impact that took place sixty-six million years before (Starr, 2012). The catastrophic effects of the event resulted in the creation of negative impacts on the earth's environmental setting. The environmental pattern changed affecting the daily lifestyle of plants and animal that existed on earth during the period. It lingered the winter impacts creating difficulty for planktons and plans to effectively undertake photosynthesis. This led to the death of plant life. Conclusively the understanding of the period plays a great role in the study of dinosaurs.
             Theory speculates that a large meteorite that was big enough to be named an asteroid hit the surface of the earth. The action took place during the period of the cretaceous period that is commonly referred to as the K-T extinction. The fall of the asteroid resulted in negative environmental impacts that affected the lives of the living things that existed on earth during the period. The contemplation of the speculation plays a relevant role in defining the key reason behind the extinction of dinosaurs. Walter Alvarez and other scientists were amon
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