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1) Which of the following disease spreads through air from infected person?​

Common cold, Influenza, Chickenpox, Mumps, Measles, Whooping cough and Tuberculosis.

Explanation:

The common cold, Influenza, Chickenpox, Mumps, Measles, Whooping cough and Tuberculosis are the diseases that can spreads through air from an infected person to the healthy person. These diseases have some viruses and bacteria that is responsible for the spreading of the these diseases. These viruses and bacteria can move from one place to another through the medium of air from infected person to the person who is not infected from this disease.

the answer to your question is:

c. complementary base-pairing

sorry, but you do not have posted the diagram.