What must scientists assume when using scientific laws to make
predictions?

Scientists make predictions from the scientific method that is Observation and Hypothesis.
Scientists use their knowledge of past events to develop a general principle and the general principle is known as a hypothesis. In the prediction the type of reasoning involved is called inductive reasoning. The scientific method helps to organize the thoughts and procedures and as a result the scientists feel confident and relax. By making the prediction the first way to create the prediction in Scientific Method is OBSERVATION so that you know how you want to go about your research. The second way is HYPOTHESIS is the answer you think you'll find.
So we can conclude that: Scientists make predictions from the scientific method that is Observation and Hypothesis.
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