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

The properties that allow this are the carbon's four valence electrons, and the fact that they can bond with other carbon atoms.

Explanation:

The properties that allow this are the carbon's four valence electrons, and the fact that they can bond with other carbon atoms.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.