How is one dimension possible?

Question

I know math states that a number line is one dimension but I never understood how it exists outside the math concept.

In: Biology

Answer 1

> but I never understood how it exists outside the math concept.

It doesn’t. Nothing in math exist outside math. Just like numbers, there is no “five” in real life. You have have five fingers, or five apple, but you cannot have only “five”. It only exist in math.