I think that the answer is Indo-European.
Hypothesis: An educated guess on the natural world possibilities
Theory: An explanation of the natural world aspect
Law: An aspect of how the natural world reacts under a specific circumstance
Hypotheses, theories, and laws all have natural world tests in common. Each of them are trying to provide the steps to guarantee a valid experimentation. You cannot have a valid experimentation without each of these. However, fact is also a need.
The region of the United States most harmed by acid rain is the East Coast, including the Appalachian Mountains and the Northeast
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