Echinoderms obtain their energy from: a. Clams and mussels c. Sea salt b. The Sun d. Sea plants and algae

The instructions for making proteins come originally from

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.

Add solid urea to a beaker of water. the beaker gets very cold. is δh favorable or