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What does it mean to be alive?

Asked by Kandy (363points) November 27th, 2011

People would argue that plants,single-cell organisms, viruses,etc. are alive. I understand that plants and fire “breathe” air and can be killed. How/why is something considered ‘alive’ if it has no brain or heart?
Am I just being dogmatic because if something doesn’t have a brain or heart, it isn’t actually alive?

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