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.

The correct answer is "It allows the scientist to determine the effect of the changed variable".

Explanation:

One of the basis of testing a hypothesis is to control the environment in order to make sure that the results of the experiments are a consequence of the variable that is being the subject of study. For instance, if the effect of amount of salt in cell's growth is going to be tested, all the other variables that could affect cell's growth should be controlled and remain constant (temperature, nutrients, pH, among others). Therefore, controlling the environment allows the scientist to determine the effect of the changed variable.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

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explanation:

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