A much more sensitive topic and probably controversial to some people is the complexity of the body and how that came about. Those who believe in the letter of the Bible and creationism believe that God created life and therefore every structure and function therein.
The staggering number of components and functions that are interrelated is staggering. Take, for instance, epithelium. There is the apical-basal polarity (crudely, that's the top and bottom of, for instance, skin tissue) but then there's also the basal lamina which is a noncellular sheet just beneath / outside of the basal surface which acts as a border crossing for molecules - it determines what gets into the epithelium from surrounding connective tissues.
Then there are the fluids that connect or lubricate.
And so on.
Is it divinely created - every single atom placed in perfect order to create each molecule which were then placed in perfect order in combinations to create each cell (and all of the components of each cell, which is an incredibly complex body in and of itself) and then each cell placed and ordered into tissues and each tissue placed and ordered into each organ and the organs placed and ordered into systems which together function as the being? Did God do that?
Or, did billions of years of random evolution go from one organism to another, slowly mutating due to environmental circumstances to grow into all of these components, failing and succeeding zillions of times to end up as the wildly diverse population of humans that we are today?
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