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The brain is the most important organ because it controls the whole body.
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Sorry but I think brain isn't the most important organ. Brain needs oxygen in order to function, right? The heart pumps blood to all part of the body, oxyginated blood specifically. So the brain can not function without the heart. So its more important, heart is more important than the brain. I hope you don;t mind.
The heart because it pumps blood to the different/all parts of our body which will make them function. 
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