Could someone me with these questions asap you!

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

What will happen if deforestation continue to destroy the green plant on the planet

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.