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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



Answer :

GinnyAnswer

Final answer:

The amount of nitrogen is the independent variable in Sarah's experiment.


Explanation:

Amount of nitrogen is the independent variable in Sarah's experiment. This is because she is studying the effect of nitrogen on plant growth, and the amount of nitrogen is what she is changing to observe its impact on the growth of root hair, height of the plants, and nodule formation.


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