What did J. Tuzo Wilson discover that confirmed Alfred Wegener's idea that the continents had once been connected?
The continents could fit together like puzzle pieces.
B
The same type of fossils can be found separated by oceans.
C
The Atlantic Ocean opens and closes repeatedly over time.
D
There are chemical blobs found deep below Earth's surface.

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.