Biology, 02.06.2020 17:57 nayelieangueira
A scientist testing the effects of a chemical on apple yield sprays an orchard with the chemical. A second orchard does not receive the chemical. In the fall, the number of apples harvested from each orchard is counted. Which of the following variables must be controlled in this experiment?
1. the amount of water that each orchard receives
2. the species of trees in the orchard
3. the number of apples that are produced by each tree
4. the size of each of the orchards
Answers: 3
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A scientist testing the effects of a chemical on apple yield sprays an orchard with the chemical. A...
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