In order to properly compare the plant’s growth, the student also measured one plant to which he did not add any extra chemicals. Which of the following terms describes this plant?

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A student decides to try putting different chemicals on plants to see if any of them help the plant grow. He treats various specimens of the same type of plant with different chemicals and obtains the following data:

CHEMICAL:

HEIGHT

(in inches):

None

30

Chemical #1

26

Chemical #2

25

Chemical #3

36

Chemical #4

12


In order to properly compare the plant’s growth, the student also measured one plant to which he did not add any extra chemicals. Which of the following terms describes this plant?