Absolute-age dating techniques can be used to determine the age of which of these?

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

What is the average speed of a car that traveled 300.0 miles in 5.5 hours

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.