Why is water clarity an important measure of water quality
A clear water does not contain nutrients
B Underwater plants cannot get enough sunlight in cloudy water
C Fish don’t get enough light when water is cloudy
D Boat captains need to see the bottom for safety

What are some possible short and long term medical concerns for crew members on longer space exploration trips

Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16

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.