What identifies the main purpose of biological taxonomy? a. classify organisms by using common names for easy identification of species by scientist b. create phylogenetic trees that organize species based on physical characteristics c. use a systematic method to name, organize, and show relationships among species d. create common names that can be applied to multiple organisms found in different regions

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.