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Sarah runs an experiment by giving different sunflowers a specific amount of fertilizer, and measuring the height of the flower two months later. Her data is given in the chart below.

Amount of Fertilizer (oz) Height of Sunflower (ft)
0.5 5.6
0.5 5.9
1.0 5.8
1.0 6.1
1.5 6.4
1.5 6.2
2.0 6.4
2.0 6.9

Identify the input variable in this experiment.


The amount of fertilizer


The height of the sunflower

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