Answer:
The height variable should be represented by the y-axis on a scatterplot.
Explanation:
The explanatory variable and independent variable are similar terms. When a variable is not at all dependent on any factor then it is called an explanatory variable. So, it must be plotted along the independent axis i.e. x-axis.
On the other hand, a response variable is an alternate term of the dependent variable and in our case height is a corresponding dependent variable of explanatory variable age.
Therefore, the height variable should be represented by the y-axis on a scatterplot. (Answer)