“Irreducible Complexity” is a (the?) cornerstone of the pseudo scientific creationist rebuttal of evolution. Or at least it was when I was young and impressionable enough to believe it.

I remember back in my Twitter days some creationist was arguing along those lines and suddenly asks, "but how does evolution create new genes??"

I briefly explained gene duplication and mutational drift and I think their entire worldview shattered when they stopped responding. Because honestly, understanding that is key. Lol