What is the relationship between drugs and medicine

What should be changed to make the following sentence true? "the stress model suggests that people with a predisposition for a disorder are more likely to develop the disorder when faced with stress."

During polarizacion potassium has a blank charge sodium has a blank charge and calcium has a blank charge

Which one of the doll choices is a bio marker of biological again that can you determine whether or not you’re doing or worse than your chronological age