Which of the following is NOT true about systems that cycle matter? A Living things play a role in the cycling of matter.
B Matter changes form as it cycles.
C Some matter is destroyed as it cycles through the environment.
D Matter is constantly cycling through the environment

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.