What was the origin of life on earth? Most biologists believe that it developed in a thin soup of organic compounds dissolved in an ancient sea. Today the seas contain no such stuff; if any is formed, it is at once destroyed by living organisms. But in the days before there were such organisms, molecules of sugars, proteins, etc. might have existed indefinitely. When two of them came in contact, they might join to form a larger molecule. Eventually, so goes the theory, a large, complicated molecule was formed that could grow by absorbing neighboring molecules and could also reproduce itself.
Growth...
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