How has seafloor spreading affected the continents? A. It has moved Africa and South America closer together.
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B. It has moved Europe and North America farther apart.
C. It has moved North America and South America closer together.
D. It has moved Africa and Europe farther apart.

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.