Which of the following objects is a burning ball of mostly hydrogen atoms?
a. an asteroid.
b. a galaxy
c. a star
d. a moon

What happened to rosalind franklin in 1956?

What are the pros and cons of transect sampling?

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.