ASAP I WILL MARK BRAINLIST. Why does competition happen?A. Different organisms have different needs.B. There are no predators in an ecosystem.C. There are limited resources in an ecosystem.D. Organisms do not need the same resources.

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.