But a more comprehensive answer to the question “What is life?” requires attention to multiple levels of meaning. The basic definition scientists give is that life is a carbon-based structure that features self-replication, metabolism, and information processing. This is probably the lowest common denominator for all existing life on Earth. If we rise to a higher level of analysis and ask what life is capable of, one can say that it is capable of giving birth to complex living organisms with a central nervous system called the brain. And further, given the evolution of more and more complex
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