Wegener examines the location of tiny rocks and the direction of grooves formed by large glaciers scraping across southern areas of africa, south america, australia, antarctia, and india. he concludes that if all these places were fitted together, they would form a continuous ice sheet expanding outward in all dirctions.

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.