Select the correct answer from each drop-down menu.
complete the sentences about earth’s early biosphere.
1st dropdown:
a. combustion
b. oxidation
c. respiration
2nd dropdown:
a. organisms
b. carbon dioxide
c. sunlight

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.