What properties of carbon's abiliyu to form different large and complex structures?

Catenation

Tetravalency

Explanation:

Catenation is the ability of carbon to forms covalent bonds with other carbon atoms and other elements to form longer chains and structures which is as a result of the presence of the vast number of organic compounds in nature.

Tetravalency property in carbon means it makes four bonds to other atoms. Carbon has four valence electrons, that is, four electrons in the outermost shell