Answer:
Truths can be opinionated and can change at any time. A truth is the state of something from a person's point of view; essentially, it is their view of reality. Truths can vary from person to person, for example some may believe that there is a god, others may not, and others may think differently than that. To them, their truth is reality. Facts, however, are impartial. They have been proven and supported over time, and tend to be accurate for long periods of time. They are a far better option than truths for science.
Basically, in science, you shouldn't use truths because they are different from person to person while facts have been proven accurate.