Scientists use results from new experiments to

support their own personal political opinions.
increase precision of data that were collected previously.
modify existing explanations of how nature works.
aid in distinguishing science from pseudoscience.

Scientists use results from new experiments to MODIFY EXISTING EXPLANATIONS OF HOW NATURE WORKS.

Our world is constantly changing. There are results from scientific studies done in earlier times that may no longer be true today due to other factors that have not been present or discovered in the earlier times. Other scientific findings may also be further affirmed as true from the results of new experiments. 

Rn in the right answer