Why is acid rain in Iceland?

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

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.

Can a trait be both polygenic and have multiple alleles? explain why or why not.