I need help with these two ( the ones that don't have a highlight on and its not answered ).

Which layer will become saturated first when rain falls?

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.

What factors contribute to the effect an environmental toxin has on the human body?