Diffusion between two gases occurs most rapidly if the gases areat a
a. low temperature and the molecules are small.
b. low temperature and the molecules are large.
c. high temperature and the molecules are large.
d. high temperature and the molecules are small.

D

Explanation:

Diffusion is directly propotional to temperature i.e. if the temperature is hight diffusion is more and vice versa

Moreover, diffusion is inversely propotional to size i.e. if molecules are large , diffusion is less and vice versa

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.