Which best explains what happens when scientific theories do not stand up to repeated experimentation? they remain theories but cannot become laws. the theories change to fit current data. the theories are replaced with hypotheses. scientists redesign their experiments to fit the theories?

The answer is "the theories change to fit current data".

The meaning of a theory is a plan to clarify something, or an arrangement of leading standards. In science a theory is an all around substantiated clarification of some part of the common world, natural world, in light of an assemblage of realities that have been over and over affirmed through perception and examination.

answer; i believe its called ; checks   and balances;

you should think about the answers you give and expect the same form your questions.