The role that humans play in artificial selection is a. to train organisms to breed more successfully. b. to create the genetic variants, which nature then selects. c. dependent on genetic engineering mechanisms. d. performed by the environment in natural selection.

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.