A forest was cleared for the building of a resort, but before construction began, secondary succession set in. Which of these describes why secondary secession appeared so rapidly? A) the clearing allowed mosses to grow quickly.

B) rock weathering occurred for lichens to grow.

C) exposed substrates allowed microbes to grow.

D) the soil components remained for plants to grow.

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.