Giraffes are also vertebrates, like humans. in fact, despite their different neck sizes, humans and giraffes have exactly seven vertebrae bones in their neck. this similarity suggests human and giraffe necks are. a. homologous structure b. analogous structure c. vestigial structure

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.