What are the variables in the graph? How are they related ?

Question

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Variables are plant height and time. As time passes the height of the plant decreases.
Variables are plant height and time. As time passes the height of the plant increases.
Variables are kinds of plants and height. The number of plants decreases as time passes.

Answer 1

The variables in the graph are plant height and time. As time passes, the height of the plant increases.