In a scientific experiment the independent variable
Is changed by the scientist.
Is kept the same during an experiment.
Is used as a standard for comparison.
Is also called the control
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Some help pls
The positive and negative controls within a given experiment stays constant throughout the whole experiment so that scientists have a standard that they can measure their results by. Knowing this definition of 'control', we see that B, C, and D all define this term. Now, we are only left with A which happens to be the right answer. The independent variable is manipulated (or changed) by the scientists so that they can ascertain that those variables affect the result (otherwise known as the dependent variable). So A is your best answer @Nerdsarecool.