Which correctly matches the structure in the leaf to the material it carries to the leaf for photosynthesis? A. veins carry water, chloroplasts take in carbon dioxide, stomata take in solar energy
B. veins carry water, stomata take in carbon dioxide, chloroplasts take in solar energy
C. veins carry sugar, stomata take in oxygen, chloroplasts take in solar energy
D. veins carry water, stomata take in oxygen, chloroplasts take in sugar

How does the carbon cycle involve an exchange of carbon

Suppose you could go back in time to interview henri becquerel on the day he discovered radioactivity. from his perspective, write an account of the discovery.

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.