True scientific models must all lead to testable hypotheses; otherwise, they are unverifiable and not so different than speculation. Note that some scientific models may not be testable at the time they are proposed if the technology of that time is not available to conduct proper tests. Sometimes, the work that goes into figuring out ways of testing new hypotheses leads to the invention of new instruments or the design of new machines that can end up having benefits greater than what they were originally designed for.
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True
true
No, it is not true but the rules must be equivalent.
No, it is not true.
not true