Would you expect a fast-moving mountain stream or the mississippi river to have more dissolved oxygen?

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

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.

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.