Awnsers are in question 3. For centuries, scientists accepted Ptolemy's view of the solar system,
which was that the Sun and planets orbit Earth. Which of the following
helped scientists gather data that caused this view to change?

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.