The earth has had a long and turbulent history. The universe was formed 12-15 billion years ago, while our Galaxy came into being around 4600 million years ago. The earth&#039;s origin can also be traced back to that time. The earliest living beings were simple; it was not until 1000 million years at least from the formation of the earth that the earliest life forms began to emerge. The more complex life forms appeared yet another 2500 million years later. Here is a list of some of the weird prehistoric creatures. 10 Weird Prehistoric Creatures
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