According to the cell theory, which structure contains cells?
a. blood
b. water
c. carbon dioxide
d. chromosome

How does a gymnosperm prevent itself from pollinating the same tree

Explain how light energy is turned into chemical energy? ! due tomorrow!

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.