Which of the following describes air temperature and air pressure at higher altitudes? A) Air temperature increase while air pressure decreases
B) Air temperature and air pressure both decrease
C) Air temperature and air pressure both increase
D) Air temperature decreases while air pressure increases

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.