All substances can be classified as volatile or inert organic or inorganic sugar or salt oxidized or reduced

Organic or inorganic

Explanation: All the substances can be classified into two categories one is organic and other one is inorganic.

The substances that is made up of carbon atoms and hydrogen atoms to from hydrocarbon. These substances are known as organic compounds. Example: nucleic acid, fatty acid, et cetera.

Inorganic compounds does not contain carbon in it. It might have some carbon atoms but the amount of carbon is so low that it cannot be used to form bonds. Example: Salt, metal et cetera.

air quality

poor drinking water

and heavy polution

can lead to poor health

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.