Approximately 30% of all solar energy is reflected back into space. If 20% of the incoming solar energy is absorbed into the atmosphere and clouds, how much is absorbed by Earth's surface?

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.