<em>*Whispering*The school secretly has bond with The Russian Hacking Government Illuminati Lizards. & are getting richer & Ri-</em> FBI OPEN UP!!!
RIP
(A) they are mixed economies
I believe the answer is: Traits
In this context, A traits refers to the characteristics that we use to describe the quality of a certain individual.
The characteristics that we use could include both personalities or physical characteristics that may influence other people perception toward that individual.
Yes, students do experience more sleep deprivation than other non students because most students stay up late at night studying for pop quiz's, exams, etc. They're probably staying up doing homework, projects, make-up work, etc. They might also be stressed out which will cause most of them to be awake at night thinking about what they are stressed out about. While other non students don't have to really worry as much as these things because they aren't in school anymore.