Question

Diffusion and its consequences in daily life

Answer 1

Diffusion of nutrients across the placental barrier. The baby's blood is on one side, the mother's on the other side. Nutrients diffse across the barrier to the baby. Waste products diffuse from the baby to the mother. You might want to look p 'counter-current flow.' 

A variety of chlorofluorocarbon compounds have been used in our society. These substances will evaporate (say, if some is spilled). The molecules diffuse through the atmosphere and have reached the stratosphere, where the ozone layer resides. These CFC's are reducing the amount of ozone in the ozone layer. This is bad, so much so that efforts are being made to replace CFCs with less-armful chemicals. 

Right now, in the Arctic, large amounts of methane are being released as we lose the ice cover due to global warming. Methane is a much better 'greenhouse gas' than CO2. As the methane diffuses through the atmosphere, expect to see an acceleration of the pace of global warming. This may be he biggest consequence of all