Infectious diseases are transmitted from person to person by direct or indirect contact. Old people, pregnant people, and infants can get sick easier. Certain types of viruses, bacteria, parasites, and fungi can all cause infectious disease
There are many factors in weight training but most commonly you will gain muscular strength and appearance.
The primary function of the lungs involving the transfer of oxygen from inhaled air into the blood and the transfer of carbon dioxide from the blood into the exhaled air.
I believe all of the above is correct.
