Multitask Are Bad And Dangerous

Multitasks during class time are bad and dangerous. Do we ever consider how does all this multitasking affect our brain and our ability? In my humanity class, I have heard, from my professor, that the student who multitasking is less productive than the student who is doing a single thing at a time. In my opinion, multitasks can lead to three bad effects such as: leak in Focusing, memory weakening, and Stress levels
increasing