इंट्रोडक्शन एक्सप्लेनेशन on life
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Life on Earth first appeared as early as 4.28 billion years ago, soon after ocean formation 4.41 billion years ago, and not long after the formation of the Earth 4.54 billion years ago. The earliest known life forms are microfossils of bacteria.
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The meaning of life as we perceive it is derived from philosophical and religious contemplation of, and scientific inquiries about existence, social ties, consciousness, and happiness. ... Science also studies and can provide recommendations for the pursuit of well-being and a related conception of morality.
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