What is the purpose of accessory pigments within the leaves of plants?

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

How can an organ, such as the lungs, work for multiple body systems?

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.