A group of college students is participating in a memory study that involves performing the same task each day under different circumstances; however, as each day goes by, the students are obviously getting more comfortable with completing the task. Which threat to internal validity has confounded this study?

practice

Explanation:

Practice effects may sensitize individuals by making them more aware of the purposes of the research and may serve as a stimulus to change or it may ginger them to change and this will influence the results of the study.

answer; ///i believe that the correct answer is because the house and senate frequently pass different versions of the same bill;