Hey StevenFire,
I find hard to believe that even the reactions occurring in the primordial bath or the first cells are simple and maybe will never be elucidated. What has occurred is a diversification in structures, the complexity (e.g. in reactions) has remained, but the communication between structures has changed.
The chemical reactions in the first cells would likely be less complex (information) than outside due to being fewer in number (rather than all possible reactions).
The diversification of structures can be seen as more complex, with different proteins being constructed and assembled.
The (theoretical) combination of two prokaryotes into a single eukaryote could be seen as reducing the information of the two individuals. Same with chloroplasts in plant cells.
The combination of cells into an organism structure would be similar to the combination of atoms into a molecular structure (some show chirality too), and the degree of complexity would be related to how you could describe the structure.
Evolution doesn't increase complexity.
I'd say it changes complexity, either increased or decreased (the change in hereditary traits in populations from generation to generation).
This guy (
Epulopiscium fishelsoni) has a pretty complex life cycle compared to other bacteria, the DNA is some 500x's the human genome, and it gives live birth to daughter cells formed inside it's cell, rather than budding.
Because it is (random) increase or decrease, it is a skewed distribution - you can only go so far into the decreased direction and still have a cell\organism.
Enjoy.
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