Here's why:

* Hypothesis: A hypothesis is a proposed explanation for an observation or a phenomenon. It's a testable statement that can be supported or refuted through experimentation or observation.

* Experimentation: Scientists design experiments to test their hypotheses. The experiment is structured to isolate and manipulate specific variables that are predicted to affect the outcome.

* Data Analysis: The results of the experiment are analyzed to see if they support or refute the hypothesis.

The process of science is iterative, meaning that the results of one experiment can lead to the formulation of new hypotheses and further experiments.