In a scientific experiment, what is a key factor that must remain unchanged to ensure accurate results?

In a scientific experiment, a control is crucial because it allows scientists to establish a baseline for comparison. The control is a standard against which the effects of the independent variable can be measured. By keeping certain factors constant through the use of controls, researchers can isolate the effect of the variable being tested and ensure that any observed changes in the experimental group can be attributed to that variable alone.

In contrast, a variable is an element that can change and is often the focus of an experiment, while the hypothesis is a prediction that can be tested and may change based on the results. Inference relates to drawing conclusions based on observations and data collected, but it is not a factor that needs to remain unchanged throughout the experiment.