Anything variable that you like. If there is only one independent variable then conventionally that is plotted on the horizontal axis while other variables go on the vertical axis. But even this is not true for population pyramids.
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Normally, the dependent variable is plotted on the y-axis and the independent variable is plotted on the x-axis.
Time is plotted on the HORIZONTAL axis. That may or may not be the x-axis. If I choose to call the distance X, then X will be plotted on the vertical axis!
Normally, the dependent variable is plotted on the y-axis and the independent variable is plotted on the x-axis.
the thing that you are measuring is usually plotted on the Y axis . the X axis is usually time scale
x axis