<span>The only way to establish a cause-and-effect relationship between two variables is to conduct an experiment.
First we state a hypothesis and then we make the experiment. The experiment should </span>support, refute, or validate our hypothesis. It is done by making<span> changes in one variable and observing is that might </span>lead to<span> changes in another variable (cause-and-effect).</span>
Answer:
Explanation:
They are hurt because cotton is one of their exports and a developing nations needs to be able to make money from them so if a big country takes away one of their main exports it will hurt their economy.
