Oncedeceived
Senior Veteran
Two major hints:
1. From basic chemical compounds, you couldn't get much more than an incredibly basic nucleotide factory in a lipid layer
Why?
2. As creatures evolve, they tend to get more and more complex, so extrapolating backwards, at some point they must have been considerably more simple.
Unless they don't. We have Cyanobacteria that go back to at least as early as 3.5 billion years ago that are basically the same now. Cyanobacteria are not incredibly simple. There are very complex life including a complex brain in the Cambrian Explosion.
As for modern mono-cellular life being complex, well, yeah. As Thunderf00t so excellently put it, "What you are looking at is the most successful organism on earth; a grizzled heavyweight champion of evolution." Modern mono-cellular eukaryotes are often very complex organisms. There is simply no reason to believe the earliest life forms were anything like that.
No reason to believe is not evidence.
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