Question

what are the three main criteria currently used to classify viruses? structure genetic makeup pathogenic potential geographic distribution hosts that can be infected chemical composition

Explanation:

Viruses are classified based on structure (shape and size), genetic makeup (type of nucleic - acid), and hosts they can infect. Geographic distribution and pathogenic potential are not the main classification criteria. Chemical composition is not one of the three main ones for virus classification.

Answer:

Hosts that can be infected, Genetic makeup, Structure