[woopwoop]

Non-obvious is necessary to avoid appending "and also the sun rises in the east and sets in the west every day" to every prediction to get it to satisfy the other three. That a fact is observational does not make it non-scientific. I have no problem calling a description of a human cell science.

I'd also add that you absolutely do not need 500 years to verify natural selection, see e.g. this video: https://www.youtube.com/watch?v=plVk4NVIUh8