How did the life start on earth? some people say there was a cell which contained life.......

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I think, whether you side with the religious view of creation, or the scientific theory of evolution, or whatever other theories are out there, we all have to agree on one thing.  Life is a very complex thing, irregardless of the type of life we are referring to.  You don't just start life by putting it together, like Legos or pieces of a jigsaw puzzle.  I think it has to come from somewhere, created by something, or someone.  Until science can realistically do that, I think we're stuck.

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As mentioned above we do not, and cannot know the answer. Aside from disagreements about religious views, even scientists do not know. While the theory related above about the emergence of life from common elements in the warmth of sea water seems to be the current popular scientific view, we must remember that science continues to advance over time and there may yet be other theories that are equally provable or believable. Science may seem like it is full of static definitive concepts, but if we study history we know that is not true and that the aim of science is to get closer and closer to the truth, even if we can never know it for certain.

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Since you posted this in the science section, I am assuming you don’t want a biblical or philosophical answer.  I would argue that while people have wondered this question since there were people, there really is no way to know the answer and no reason to know.  It may be a religious or scientific mental exercise, but that is about it.

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I have read that the first forms of life were bacteria, and as pohnpie397 states, that these were formed from a combination of elements in sea water, in very deep sea vents.  It does not appear that there is much disagreement among scientists on this theory. 

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We'll never know for sure.  Scientists generally believe that various elements needed to create life were present in the waters of ancient Earth (perhaps brought by comets).  The warm waters gave them a chance to mix together until life was able to form.

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