What is the definition of antibodies?

A. Helps fight the intruders and are custom-made to each virus

B. How germs get into the body to make you sick

C. Germs, such as viruses, are intruder-like substances

D. When antibodies create a lifelong resistance to a virus

The answer is A. Helps fight the intruders and are custom-made to each virus

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases.