Question

All substances can be classified as _____?

Answer 1

I believe that the answer is that, all substances can be classified as either organic or inorganic substances.
 Organic compound are a large class of gaseous, liquid, or solid compounds whose molecules contain one or more carbon atoms that are covalently linked to atoms of other elements, mainly, hydrogen, oxygen or nitrogen. Inorganic compounds on other hand are compounds with no carbon element on them, such as water. 

Answer 2

Answer: 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.