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22 June, 11:31

Sarah performs an experiment to determine the effect of nitrogen on plants. She studies the effect of nitrogen on the growth of the root hair, height of the plants, and nodule formation. Which factor is an independent variable?

a) Amount of Nitrogen

b) Growth of Root Hair

c) Nodule Formation

d) Height of the Plants

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  1. 22 June, 11:49
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    The only independent variable in this experiment is the amount of nitrogen Sarah uses. All of the other variables are dependent on other factor and processes, but Sarah controls the amount of nitrogen that she uses for each plant.
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