Question: of these the following 3 are classified as phss:
Answer: --> Of these the following 3 are classified as PHSs:

Question: the other result of burning hydrocarbon fuels and of burning carbon (coal) is the increase in the carbon dioxide content of the air and its effect on the greenhouse effect.
Answer: --> The other result of burning hydrocarbon fuels and of burning carbon (coal) is the increase in the carbon dioxide content of the air and its effect on the greenhouse effect.

Question: comment on osmosis and diffusion
Answer:
--> Comment on Osmosis and Diffusion