I know math states that a number line is one dimension but I never understood how it exists outside the math concept.
In: Biology
Without getting into the deeper existential questions about math as a model of reality, I think the simplest answer is that literally anything you measure with a single number exists in one dimension. For example:
Your age.
The time of day.
The temperature of your stove.
To say these things have one dimension is to say that any change can either increase, decrease, or stay the same. Your age cannot change in some sense that you would use the same number to describe it.
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