When earth's atmosphere becomes favorable for the life. Then unicellular organisms came into existence, which are single cell organism. After thousand years ago multicellular organisms came into existence in which dinosaurs were one of leading creature at that time.
Dinosaurs were the most common at that time,, They were of many types such as herbivorous, carnivorous etc. Many flying dinosaurs were also present.. They became big problem for the nature. May be it was realised by nature and at one day,,, a huge asteroid hits the earth...
When it happened, then a huge amount of energy was released which was almost equal to lakhs of atom bombs. Within a seconds many dinosaurs were became dead. And who were survived, becomes dead afer few years,, due to critical conditions of earth's atmosphere..
When that asteroid hits the earth's surface then huge amount of dust particles was scatter in the earth's atmosphere which created the blanket of dust particles around the earth... Due to this light coming from the sun was blocked for many years. Due to absence of sunlight. earth's temperature went down.
And all the dinosaurs were extinct from earth due to worst conditions of atmosphere.
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