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What was the first living creature and what features did it have?
The answer can then be analyzed and see if it even possible.
If the first living thing was just proteins, how did it ever get evolve to use RNA and DNA? They are irreducibly complex. You need all the parts to be working for it not to be destruction.
If it was just RNA based, how did it to ever evolve to use DNA? It is irreducibly complex. You need all the parts to be working for it not to be destruction.
If it was just DNA based, how did it to ever evolve to use RNA? It is irreducibly complex. You need all the parts to be working for it not to be destruction.
It is was any mixture of these, then how could it or DNA, RNA, or proteins have evolved at all?
The problem for each of these scenarios is the same. A very large specific sequence of amino acids would not happen through natural processes. Here are the calculations.
A first living creature would have to have had at least 100,000 amino acids
in a particular sequence. This is extremely generous. The smallest free-living thing has over 1,300,000 base pairs. I also have not included having over 500 million other atoms in it.
The odds against a sequence of 100,000 amino acids (20 types, 39 counting handedness) coming to be by random chance is (10 to the 160,000 power) to 1. That could never have happened anywhere in the universe over the supposed 13.7 billion years of its existence. It actually is impossible because no concentration of that amount of amino acids would happen by random chance. There are other factors that make it impossible. It would be a miracle.Where would such an amount of amino acids even occur in nature to even make a first creature? They must be in very near proximity to where the first creature came to be. In water they would immediately diluted and chemical reactions would destroy it. And above ground or in space, it would be destroyed by the the sunlight. So the first creature is impossible.
If such a great miracle did occur, the poor creature will not survive long at all. It is not protected from its environment. Chemical reactions will begin to destroy it within seconds. Which is just another problem. It would take too long to assemble itself. Destruction will happen faster than construction.
The poor creature cannot feed itself. It will also not be able to repair itself.
It will not be able to have any offspring. So it could never exist. So even if it did come into existence, it would die quickly and could not have offspring
And that is just to get to the first living thing. There would have to at least 1 trillion other miracles to produce all the living creatures by evolution. That would be about 70 miracles for each of the supposed 13.7 billion years.