Read the text, Why do you think Frederick Douglass was a convincing spokesperson for the cause of abolition?

Why do you think Frederick Douglass was a convincing spokesperson for the cause of abolition? He was once an educated slave and could speak personally of his experience. ... He shared his personal experience which made people realize that he is just like them. He wrote speeches that inspired them.

Explanation:

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

answer; regard the action of other people negatively;