Well when scientists wish to learn something, they use the scientific method. The first step is to observe something/could be a problem. Then ask a question about it. Form a hypothesis, or a possible answer to that question. These are the first steps.
Further steps include setting up an experiment and results, etc, but I think you know the rest! Hope this helps!
I want to say Germany and Ireland
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Triangular trade or triangle trade is a historical term indicating trade among three ports or regions.
A. The attempted extermination of European Jews and others by the Nazis.