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28 February, 03:05

Groups of five plants are given 1, 2, and 3 grams of nitrate and 1, 2, and 3 grams of phosphate in all combinations over a period of one month. The researcher measures plant height and weight at the end of the experiment. What is missing in this experimental design?

Question 9 options:

a control

an independent variable

a dependent variable

a constant

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Answers (1)
  1. 28 February, 03:22
    0
    a control

    Explanation:

    you need something to compare it to to see if anything happens
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