At element makes up all organic compounds?

Explanation:

The term organic matter refers to the matter in the living organisms. Nowadays, organic compounds, the object of organic chemistry, are the compounds that contain carbon except carbon oxides, carbides and carbonates (which are considered inorganic compounds).

Organic compounds form a vast  variety of vital compounds based on the versatility of carbon atoms.

Carbon atoms have four valence electrons which can form a variety of single, double, and triple bonds with it self, to form long chains.

Carbon atoms can also form bonds with other elements like, hydrogen, oxygen, nitrogen, halogens, among others, to form different kind of compounds: alkanes, alkenes, alkynes, alcohols, aldehydes, esters, eters, amines, amides, polymers, among others.

Thus, organic compounds form a vast subject of study based on the  special chemical properties of carbon.