That’s not a rock. That’s a picture of a rock.

This sounds like something a utahraptor would say…

Pedantic: You mean Y-axis, right? Technically, neither start at zero but I think you meant Y based on context.

IIRC, if someone in the line of succession is ineligible (underage, non-native citizen, already been president for too many years, etc), then they are skipped over.

Neither of these are going to happen.