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In an experiment the amount of fertilizer is changed and plant height is measured. Which factor is most essential to keep constant for a fair test?

Answer and explanation

Correct answer: Plant species and initial age

Species and initial age can affect growth so they should be controlled. In exams look for possible confounding variables.

Related tags

Controlled VariableFair TestPlant GrowthFertilizerHypothesis And ExperimentationExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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