Which of the following statements best helps justify the inclusion of test tube 5 as a control in the experiment?

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A researcher claims that the initial rise of oxygen in Earth's early atmosphere, which occurred approximately 2.3 billion years ago, resulted from the metabolic activity of prokaryotic organisms.
Which of the following types of evidence will best support

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7.A researcher designs an experiment to investigate the effect of environmentaltemperature on the function of an enzyme. For each trial included in the experiment,the researcher will add the enzyme and its substrate to an aqueous buffer solution andthen measure the amount of product formed over 20 minutes. Which of the followingmust remain the same for all trials of this experiment?A.The initial concentration of the substrate.B.The final concentration of the product.C.The three-dimensional structure of the enzyme.D.The temperature of the aqueous buffer solution.