What is the purpose of controlling the environment when testing a hypothesis? It allows the scientist to determine the effect of the changed variable. It allows samples and organisms to be tested under comfortable conditions. It makes it easier for the scientist to perform the steps of the experiment. It ensures that the scientist is undisturbed while performing the experiment.
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A hypothesis isn't necessarily right. Instead, it's a "best guess," and the scientist must test it to see if it's actually correct. Scientists test hypotheses by making predictions: if hypothesis \text XXstart text, X, end text is right, then \text YYstart text, Y, end text should be true. Then, they do experiments or make observations to see if the predictions are correct. If they are, the hypothesis is supported. If they aren't, it may be time for a new hypothesis.
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