A scientist testing the effects of a chemical on apple yield (apples/acre) spray

Question

A scientist testing the effects of a chemical on apple yield (apples/acre) sprays an orchard with the chemical. A second orchard does not receive the chemical. In the fall, the yield is determined (number of apples harvested per acre). Which of the following variables must be controlled in this experiment? Note: Orchards have uniform tree spacing, such that the trees per acre are equivalent between the two orchards. the amount of water that each orchard receives the number of apples that are produced by each tree the species of trees in the orchard the size of each of the orchards

Explanation / Answer

Which of the following variables must be controlled in this experiment?

C) The species of trees in the orchards.

In addition, option A) the amount of water that each orchard receives, and opton D) the size of each of the orchards, can also be included with the option C if multiple answers are permitted.

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