Which statement describes the effects of farming practices such as the overuse of irrigation water? A. More areas have polluted soil, increasing crop variety. B. Fewer areas have polluted soil, reducing crop variety. C. More areas have polluted soil, reducing crop variety. D. Fewer areas have polluted soil, increasing crop variety.​

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.