Basketball and going on my phone wbu :)
Yes, I will submit a cover letter. Cover letters are crucial in addition to a resume, because a cover letter gives more information than a resume can about experience. It helps the employer understand what position you seek and how you are qualified for it. A cover letter also gives more attention to greater experiences and achievements. Many employers want background information about why a potential employee is qualified, and it shows an extra level of effort.
Since this is an open question with no choices, I am answering with what I think will best fill in the blank. Note: I do not know exactly what answer they are looking for.
The best answer is: REM
REM is the stage of sleep where dreaming occurs. REM stands for Rapid Eye Movement. Exactly as the title says, REM sleep is characterized by fast back and forth movement of the eyes.