It is the part that is closest to the normal situation. The control is compared with the experimental part. The experimental section is what you change or do, to a sample, during the experiment. If you try to compare several differences at the same time you can not tell which one caused the changes you observe between the control variable and the experimental variable. Usually one obtains or gathers pieces of information while doing experiments.
Results are what happened.
Results may be presented as data or in words. You simply explain or show how your experiment turned out. Specific facts, like numbers, are called data. Data is usually written in a table, known as a data table. Often data is also put on a graph.