In an experiment, investigators try to control all of the variables except one—the one that tests the hypothesis. which of the following reasons is the primary rationale for controlling variables in an experiment?
a. to enable investigators to repeat the test.
b. to create a control group.
c. to eliminate alternative explanations for the results of an experiment.

To eliminate alternative explanations for the results of an experiment.

Explanation:

The scientific experiments include all the procedure and observations that are observed during the experiments. The scientific experiments explain about the correct scientific information.

The particular hypothesis is tested by the scientific experiments. The experiments include controls and the variables. The variable that are used as hypothesis is not controlled and the results are matched directly. The other variables are controlled as this includes the other alternative explanation of the particular result.

Thus, the correct answer is option (C).

the answer would be knowledge about cars!

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.