Life was essentially created out of chemicals bonding together in specific ways, through random chance and the addition of the right amounts of energy like heat and motion.
It’s very, very, very, very difficult to make this work. Almost impossible, the chances of us doing it are like 0.000000000000001% or something crazy. No human could ever hope to achieve it in our lifetimes.
But then, the Earth is so very old. If you have billions of puddles, streams, lakes, seas and rivers, over a billion years, eventually some of these random chances occur, and then more things happen involving the newer comibned chemicals and elements, because they’ve changed, so they may react to new situations every so slightly differently.
It would be like saying ‘one day a meteorite will fall through basketball hoop.’ It probably could happen, as meteorites are rare, and the chances of one going through a hoop is really slim.
But then, if you covered 2/3rds of the Earth in basketball hoops and left them for a billion years… eventually one would probably go through the hoop.
Same applies with life.
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