Which statement accurately describes the rock layers?

layer 8 is older than layer 1

layer 3 is younger that layer 6

layer 4 and layer 10 are the same relative age

layer 2 and layer 9 ads the same relative age

Which nucleotide component contains nitrogen

Tropical rain forests support more species per unit area than any other terrestrial ecosystem. what is one way rain forests are important to the health of the biosphere?

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.