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I'd have to break it into three levels of importance;
On a physical level, you are alive because your body is functioning correctly. The most important parts of your bodily functions are involuntary by nature, such as your heart beating, and your lungs breathing.
The second level would be instincts. They are mostly involuntary reactions that are programmed into us from birth. As far as I know, insticts arent quite understood yet, but I havent done a lot of research in that area. They are definitely with us from birth however. They keep us alive by deterring us from actions that would cause harm.
The final level is completely voluntary, and thats our mental state. Compared to most other animals, humans seem to be less ruled by insticts, and more by emotions. Since we're not always following what our instincts tell us to do, we can choose whether or not we want to live.
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