How does the size of a cell affect the diffusion of substances into a cell?

Which of the following is a consequence of urban heat islands? increased precipitation downwind of the city? increased precipitation upwind of the city? decreased winds within the city? increased winds within the city?

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure