Where does the り come from in some ます conjugations?

I have a questions, why does 踊る become 踊ります? but 寝る becomes 寝ます, where does the り come from?

I asked ChatGPT multipel times but it didn’t give me the answer. I have been asking myself this for weeks and I just can’t find out why. I literally going insane

by Elegant_Pianist_8650

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